Sergeant Willie Demby began his career with HISD Police Department in 2009 as a Campus Officer at Sterling High School. Prior to his tenure with HISD, he has previously served with both the Houston Police Department and Fort Bend County Constables office. Sgt. Demby has over 22 years in serving the law enforcement community.

Sgt. Demby has experience in campus operations, patrol operations and was the Lead Investigator in the Criminal Investigations Division. Sgt. Demby received the 2019 Investigator of the Year Award, the 2016 HISD Employee of the Month Award, the2013-2014 HISD Police Department Employee of the Year Award, and in that same year Sgt. Demby was the receipient of the Department's Life Saving Award.

Sgt. Demby holds a bachelor’s degree in Criminal Justice from Texas Southern University and holds a Master Peace Officer certification with Texas Commission on Law Enforcement (TCOLE). 

Email:  wdemby@houstonisd.org

Sergeant Jorge A. Ramos began his law enforcement career in 2014 where after completing the police academy with HCC Northeast campus, he was hired on with Harris County Constables Office Precinct 5. While there, Sergeant Ramos was assigned to the Toll Road Traffic Enforcement division where he worked night shift.

 Sergeant Ramos made the transition to HISD team in 2015 where his first assignment was Key Middle School and worked there for 2.5 years. While there, Sergeant Ramos built many relationships with school administration as well as students in need with low-income backgrounds. Sergeant Ramos made the transition to Dayshift Patrol and became part of the Emergency Response Team where he attended SWAT School as well as other tactical courses. During his tenure on dayshift patrol, Sergeant Ramos became a Field Training Officer (FTO), obtained his certifications in ALERT I, ALERT II, SBLE (Active Shooter train the trainer), CPR and Safety Range Officer (SRO).

Sergeant Ramos currently holds his bachelor’s degree in psychology with a minor in Spanish and has his Advanced Peace officer certification.

Email: jramos15@houstonisd.org

Justin T. Williams is proud to serve as a Sergeant for the Houston ISD Police Department.  In 2007, Sgt. Williams began his law enforcement career as a police officer for the City of Forest Hill Police Department (Dallas-Fort Worth area).  In 2009, Sgt. Williams was hired as a police officer and his first assignment was Yates High School.  During that time, he had the opportunity to meet many interesting people, who served within the community, in which he formed life-long bonds.

Sgt. Williams has held various positions as an officer and sergeant within the police department which include: campus, patrol, the Emergency Response Team, a Field Training Officer and various committees.  Sgt. Williams is currently assigned to Campus Operations in which he enthusiastically supervises the hard working officers in the newly formed South-Central District. 

Sgt. Williams received his B.A. in criminal justice and is working towards his M.A.  Outside of work, Sgt. Williams enjoys sports, outdoor activities, expanding his mind, and spending time with his wife, Shalia, and three kids, Jace, Jeremiah and Ella.

Email: jwilli58@houstonisd.org

I started my Law Enforcement career in November of 2002 with Fort Bend County Constable Precinct 2 as a Deputy. I enforced traffic laws, responded to calls for service, served civil papers to residents and served as a Bailiff in court. I also conducted investigations involving accidents, misdemeanors, and felonies. 

In November of 2003 I moved on to Texas Southern University Police Department where I was an evening shift patrol officer. I patrolled the campus and surrounding areas taking calls for service and investigating accidents, misdemeanors, and felony crimes. In my first year with TSU I became a FTO and trained several officers. I gained experience in processing a crime scene by developing and lifting latent fingerprints and maintaining a complete and accurate evidence and crime log. After two years of service I was promoted to rank of Corporal.  As Corporal I supervised 16 officers and had to review reports, complete daily logs and handle weekly scheduling. As an Officer and Corporal, I continued to conduct myself in accordance with high ethical standards both on and off duty.

In June of 2008 I started serving as a Police officer for Houston ISD Police Department. As a day shift patrol officer, I provided a safe learning and working environment for the students, staff, district and community. I was given the duty as a FTO to train new officers and to teach officers as an instructor. In less than 6 months I became a traffic enforcement officer (Zebra Unit) then went on to becoming an investigator assigned to the Gang Suppression Unit. During the years I obtained a Master Peace Officer certification, Instructor Certification, Special Investigator Certification, Police Bicycle Certification and S.F.S.T Practitioner Certification.  In December 2018 I was promoted to Sergeant and served as a day shift patrol Sergeant. I am currently assigned to Campus Operations as the South District.

Email:  OSIMMONS@houstonisd.org

Police Sergeant Randy A. Jefferson is a 9 ½ year veteran officer of The Houston ISD Police Department (10 ½ years total). Formerly working as a Campus and Patrol Officer, he now serves as Campus Sergeant assigned to The East District where he supervises numerous officers that maintain peace for the students and staff on their campuses. Prior to becoming a police officer, in 2006 he became a Detention Officer for the Harris County Sheriff’s Office. After gaining great experience while working in a jail setting, he decided he decided to take his talents to a different side of Law Enforcement. In 2009, he attended and graduated from The University of Houston-Downtown’s Police Academy (BPOC 241) where he maintained a 90% GPA. In June of 2010, Randy was hired as a police officer for The City of Bellaire. Randy received a lot of great training, experiences, and knowledge while employed for The City of Bellaire. He eventually made his way to The Houston ISD Police Department where he has worked both patrol and campus divisions. He has worked hard at becoming a strong asset to his department mainly when he decided to become a Field Training Officer. He has trained over 15 officers throughout his tenure as a field training officer. Officer Jefferson has exhibited all the exemplary attributes needed to be a model police officer with the Houston ISD Police Department. While employed at Houston ISD PD, he obtained his Advanced Police Officer Certification from TCOLE. In January of 2020, Randy was promoted to the rank of Sergeant.

Sergeant Jefferson is a husband and devoted father to Bryce and Landen Jefferson. Officer Jefferson enjoys spending time with his family.

Email: rjeffe10@houstonisd.org

Sergeant Jason R. Austin began his law enforcement career in 2016 when he joined the Houston ISD Police Department. From 2006-2016, Sergeant Austin worked as Special Education teacher/coach in Goose Creek CISD and taught in Alvin ISD. While working in Alvin ISD, he attended the Houston Community College Police Academy. Prior to that, Sergeant Austin attended Prairie View A&M University where received a Bachelor of Science Degree in Communications, was a three-year starter on the football team, and became a member of the Eta Gamma chapter of Alpha Phi Alpha Fraternity Inc. He is currently pursuing Master of Science in Criminal Justice at the University of Houston-Downtown. Sergeant Austin worked as a campus officer at multiple schools throughout the district before being promoted in 2020. He currently holds an Intermediate Peace Officer certification and oversees Night Shift Patrol operations.

Sergeant Lynson Alexander is a native Texan, born and raised in Port Arthur Texas.  Lynson is a veteran of the Houston Police department 26.9 years. Lynson is currently assigned the West Campus area of schools and school district facilities.

After graduating from high School Sergeant L. Alexander attended Prairie View A&MU then took an early exit from Prairie View A&MU and joined the U. S Army ranks as a Combat Engineer. L. Alexander retired from the active Army and Joined the Texas National Guards and later returned attended Prairie View A&M university and earned a Bachelor Science Degree In Juvenile Criminal Justice. In 1992, L. Alexander graduated from Houston Community College Police Academy and became a police officer with the Houston ISD Police department in 1994. Lynson holds a Master Police Officer License, TCOLE Instructor certification, FTO instructor certification, First Line Supervisor certification, FBI LEEDA Command Certification, FBI LEEDA Supervisor Certification.

Sergeant Alexander holds an Ordained Elders ministers license with The International Church of God In Christ and works off duty as a Church leader administratively with several local churches under the COGIC Texas South East jurisdictional leaders. L. Alexander enjoys traveling in foreign countries on evangelistic missions and well and leisure travel.

Email: LALEXAN1@houstonisd.org

Sergeant Brendon Jeremie began his Law Enforcement career in 2006 with the New York City Police Department. In 2012, Sergeant Jeremie relocated to Houston and completed his Peace Officer certification at the University of Houston-Downtown, Criminal Justice Training Center. After gaining his Peace Officer certification, Sergeant Jeremie served as a Reserve Deputy with the Fort Bend County Constable Pct 3. In 2013, Sergeant Jeremie joined the Houston Independent School District Police Department as a Campus Officer at Heights High School. He served the students, faculty, and community of Heights High School for seven proud years.

Sergeant Jeremie is a certified T.C.O.L.E., D.A.R.E., and TAPS instructor and Field Training Officer for the H.I.S.D. Police Department. He currently serves as a Campus Operations Sergeant.

Email: BJEREMIE@houstonisd.org

Sergeant Melva DeAnda is a native Texan, born and raised in the Lubbock area of West Texas. She is a veteran of the Houston ISD Police department for 29 ½ years. She is currently assigned to the Northwest Campus area of schools and school district facilities.

After graduating high school, Sergeant DeAnda attended South Plains College and Pan American University.  Melva earned a bachelor’s degree in Criminal Justice in Police Administration.  In 1991, Melva became a police officer.  She holds her Master Peace Officer License, Basic Police Instructors License, Operation Lifesavers and GREAT-Gang Resistance Education and Training Instructors Certificates.  

Melva has earned many awards, accolades, and accommodations for her service and dedication to the school district and police department. As a gang officer, Melva received the Houston Police Department Commendation from Chief of Police C.E. Bradford for the McKee St Initiative, which resulted in changing State of Texas laws. Also, Melva assisted the department in achieving its 2^nd Accreditation Award in 2006: Her CALEA file folders were deemed best by accreditation auditors.

Melva graduated from the Sam Houston State University Leadership Command College (LCC), publishing her first article “Police Presence in Schools.” Melva is a graduate of the FBI- LEEDA (Law Enforcement Executive Development Association) training where she received the Trilogy Award. Melva also attended and graduated from the LEMIT LIFE program from the Leadership Inventory for Female Executives.

Melva has worked in every division and unit assignment within the police department as an officer and supervisor. From the Accreditation Unit, Administrative Units (Training Sergeant – Investigation Unit), Campus Operations, Communications, and Patrol Operations. Melva has conducted mandated audits that were vital in recognizing deficiencies within the police department.

In Melva’s spare time, she loves to travel. She has visited several European countries most notably, Paris-France, Germany, Italy, Spain, and Austria.   In 2016, she hiked (trekked) a 26-mile journey on the Inca Trail to reach the legendary Machu Picchu peak in Peru. 

Melva considers herself to be an artist.  She loves to draw, mostly people and portraits.    She was once asked to display her work in an art gallery.   On Sundays, you can find Melva on the piano, the start of a new hobby. 

Email:  MDEANDA@houstonisd.org

In 2002 Sergeant Davis attended the University of Houston-Downtown police academy BPOC 178 where he obtained his basic peace officer license. He began his law enforcement career in 2002 working for the City of Montgomery Police Department. He was assigned to night shift patrol where he worked for 4 years until he left Montgomery PD and went to work for FT. Bend County Constable Pct. #2. Sergeant Davis remained there for 2 years working patrol in Missouri City, TX. Sergeant Davis worked patrol and investigated many gang related cases.  Sergeant Davis started his career with HISD PD in April of 2008.

Sergeant Davis has been employed with the Houston Independent School District Police Department for 13 years. When he started with HISD PD, he was assigned to campus operations. Sergeant Davis was assigned to Westbury High School and Westside High School before being promoted to Detective in January of 2013. He was assigned to the HISD PD Gang Suppression Unit where he investigated gang activity, criminal mischiefs and sexual assaults.

After being in the gang unit for 2 years he was promoted to Sergeant in January of 2015. Sergeant Davis has been the Sergeant over Campus operations-North, Northeast and South districts, Investigations/Gang Suppression Unit, and 1^st Shift Patrol over the last 6 years.

Sergeant Davis currently holds his Master peace officer certificate and is a Field Training Officer (FTO) and a Field Training Sergeant (FTS). Sergeant Davis is currently a board member of the Houston ISD police association.

Email:  ADAVIS15@houstonisd.org

Sgt. Martinez-Lopez began her career with the Police Department in December 1994. While a campus officer, she introduced RAD (Rape Aggression Defense program, a Self Defense Program for women, giving the students tools needed in order to prevent or escape harmful situations. After eighteen years in campus operations, she transferred to patrol Division. Being assigned to power shift, she was involved in a variety of community engagements, and introduced presentations covering different topics to the HISD community. She promoted to Sergeant on November 2014, and is currently assigned to second shift patrol division.

Sergeant Martinez-Lopez holds a Master TCOLE Peace Officer License, Associate of Applied Science Degree, Basic Instructor Certificate and over 3,500 hours of TCOLE training. 

Native Texan Vanessa Losey is a sergeant for HISD Police Department. Prior to becoming a sergeant, Officer V. Losey was a member of HISD PD C.O.R.E (Community Outreach Responsive Engagement) that provided opportunities for positive interactions with HISD students, parents and faculty and all HISD PD staff to have a large impact in changing the dynamics of the relationship between the police and the community. Sergeant V. Losey joined the HISD Police Department in 2015 where she has served as a Campus Officer (Sharpstown High School), certified TCOLE, D.A.R.E and T.A.P.S Instructor. In her free time, Losey enjoys spending time with her family, traveling and taking pictures of her dog Lola.

Sgt. V. Losey's favorite quote:

“If you can’t fly then run, if you can’t run then walk, if you can’t walk then crawl, but whatever you do you have to keep moving forward.”

-Dr. Martin Luther King Jr. 

Email:  vlosey@houstonisd.org

I am a native of Houston, Texas and a 1984 graduate of Charles H. Milby Sr. High School. Immediately after graduation, I enlisted in the United State Marine Corps to proudly serve my country. After completing basic training at MCRD San Diego, California my first parent command was in the West Pacific. Between numerous deployments I was assigned to the 9th Engineering Support Battalion in Okinawa, Japan where I studied Shorin-Ryu Karate under the linage of the Shimabukuro family. As time progressed, I continued to study and become increasingly proficient in self-defense, crime prevention, and tragedy avoidance tactical systems such as:

• The United States Marine Corps Linear Infighting Neural Engagement Combat System
• The Israeli Krav Maga Defense System Law Enforcement Instructor Program (Santa Monica, California)

As a resident of Southern California, I had the unfortunate experience of witnessing multiple acts of aggressive criminal behavior to include the thoughtless and senseless shooting of a 14-year-old female. The fatal incident eventually became the primary driving force that motivated me to become a law enforcement officer help with thew protection of kids.

I attended Gus George Law Enforcement Law Enforcement Academy in Fort Bend, Texas and began my career in law enforcement shortly afterwards. To name a few of my tactical related certifications to date please view below:

• 18-year police veteran/Master Peace Officer
• L.E.R.R.T. Instructor (Advanced Law Enforcement Rapid Response Training)
• L.I.C.E. Instructor (Alert Lockdown Inform Counter Evacuate)
• Homeland Security Active Shooter Instructor
• Force on Force Simunitions Instructor
• Dignitary Protection Instructor
• E. Firearms Instructor
• Tactical Cuffing, A.S.P. Baton, and Oleoresin Capsicum Instructor
• Aikido based Rape Aggression System Program Instructor
• Taser Instructor

Over the years I have come to believe that we allow ourselves to become part of the problem when we do not allow our skills to be used as part of the solution. I agree that it is necessary for a safe environment to exist for the teachers to teach, and students to learn.

Email: KBROWN10@houstonisd.org

Sergeant Hayes began his career with the HISD Police Department in 2014 as a campus officer assigned to Evan E. Worthing High School. He has experience in campus operations, patrol operations, criminal investigations, and currently serves as the training coordinator.

Sergeant Hayes holds an Advanced Peace Officer certification and is certified with the Texas Commission on Law Enforcement in many different areas. Prior to joining HISD Police Department, he was employed with the Texas Department of Criminal Justice as a Correctional Officer and served in supervisory roles.

Hayes earned a bachelor’s degree in Interdisciplinary Studies from the University of Houston-Downtown as well as a certificate of Leadership.

 Email:  JHAYES8@houstonisd.org

Sergeant Denise Royal began her career with Houston Independent School District in 1999 as an educator. In 2007 she enrolled in the Police Academy at HCC and began her law enforcement career with Houston ISD Police Department in January 2008. Sergeant DA Royal currently holds Field Training Officer, Mental Health, Peer Mediation, Telecommunications, SAFVIC, and Master Certifications with TCOLE. Sergeant DA Royal currently oversees First Shift Patrol Operations.

Email:  DROYAL@houstonisd.org

Since 2008, Sergeant Tridung Tran has been with the Houston ISD Police Department. He was the inaugural group of applicants selected to be part of the Houston ISD Police Department "Police Cadet" program. The program allows Houston ISD Police to sponsor an individual with salary and tuition for the police academy program at the University of Houston- Downtown Criminal Justice Center. Due to the program's success, the program has paved the way for additional groups of individuals selected to become part of the Houston ISD Police Department. After completing the program and Field Training Program, Sergeant Tran was assigned to campus operations and worked several campuses.

After some time in Campus Operations, Sergeant Tran was transferred to patrol operations and served on 2^nd shift patrol for an extended period. During that time, Sergeant Tran was a "zebra" unit was assigned to investigate traffic accidents involving HISD vehicles and traffic enforcement in school zones. While serving on second shift patrol, his unit earned the  Unit Citation of the Year Award and became a Field Training Officer.

In 2013, Sergeant Tran was promoted and assigned to First Shift patrol. Sergeant Tran worked on various assignments during this time, including CALEA, special project, record management system, report writing, grant proposal, instructor, and K9 Supervisor.  Sergeant Tran graduated from Leadership Command College and currently supervising and leading Patrol, K9, and CALEA.

Sergeant Quintanilla attended the University of Houston Downtown Police Academy where she received three Academic accommodations and two Physical Training accommodations.

Before joining the Houston ISD Police Department, Sergeant Quintanilla was a Police Chaplin for the Pearland Police Department.

Sergeant Quintanilla is an advanced peace officer and has been a sworn member of the Houston ISD Police Department since 2013. During this time, she has been assigned to campus operation, where she became certified in Field Training, Police Bicycle Certification and S.F.S.T.

In addition to the primary duties, Sergeant Quintanilla served as a detective in criminal investigation division where she was certified in Child Abuse Prevention/Investigation, Technic Interviewing and Interrogation, Background Investigations, Crime Scene Investigations, Criminal Investigation, and Special Investigator.

June of 2018 Sergeant Quintanilla was certified as in Internal Affair investigator, she was then assigned to the Internal Affairs Division. Sergeant Quintanilla was honored with the Certificate of Appreciation Impact Award from HISD customer Service.

In December 2018 Sergeant Quintanilla was promoted to Sergeant and was assigned to the East District where she supervised over 20 officers. In 2019 she was assigned to Internal Affairs Division where she served as Sergeant over this Division. As of 2021 Sergeant Quintanilla, has been assigned to Criminal investigation where she supervises the direction of the detectives.

In addition to the 2018 certificate of Appreciation impact Award she has been honored to receive the Unit Citation Award 2016, Unit Citation Award 2018, and the Certificate of Appreciation 2018.

Email:  SQUINTA3@houstonisd.org

Sergeant Mapp comes from a Family of Law Enforcement, where his Father Clifton E Mapp Senior was a part of The Houston Police Department as a Mechanic back in 1973 and later started his career as a Deputy Constable with Harris County Constables Precinct 6 back in 1982, Clifton Senior retired 1994, but his Legacy continued through Sergeant Mapp Jr.

Sergeant Mapp Jr. begin his journey of pursuing Law Enforcement in the year of 2006 where he enrolled into North Harris College Parkway Center Law Enforcement Academy, Sergeant Mapp Jr. then started his career at Aldine ISD Police Department on January 18, 2007, where he worked Patrol Division Day shift, Second Shift, and Night Shift Patrol, also worked as a Dispatcher. Sergeant Mapp Jr. along with all of Night Shift Patrol were awarded Officers of the Quarter after AISD had several burglaries, the night shift crew working while others were sleeping during the night were able to apprehend the suspect.

Sergeant Mapp Jr. came over to Houston ISD Police Department November 04, 2009, where he worked Campus Operations Serving as a Campus Police Officer at Booker T Washington Senior High School for 4 years and several other Campuses as well. Sergeant Mapp Jr. later started in the Patrol Division; Sergeant Mapp Jr was then promoted to the rank of Sergeant on August 13, 2021.

Sergeant Mapp Jr. has experience ranging from Basic SWAT Certification where he completed S.W.A.T. School at Conroe Police Department in 2008, Dispatcher Training from Montgomery County Sheriffs Office 2007, Federal Bureau of Investigation Gus George LEA Terrorism completed 2007, Federal Bureau of Investigation Gus George LEA Terrorism and Education completed 2007, Sexual Assault Family Violence Investigator SAFVIC Completed 2007, Advance Law Enforcement Rapid Response Training ALERRT 2007, North Harris Montgomery College, Texas Southern University TSU Tigers!

Sergeant Mapp Jr. is a Field Training Officer and a Basic Instructor and holds an Advance Peace Officer License.

Sgt. Sophus also served 10 years in the United States Army, achieving the rank of sergeant. Afterwards, he attended the University of Houston Downtown Police Academy, and received his police certification. Sergeant Sophus began his law enforcement career with Ft. Bend County Pct. 2 in August 1999. During his time with the Ft. Bend County Pct.2, his serviced as a patrol deputy and warrants deputy.

In Oct 2001, he began his new career with the Houston ISD Police Department. Sergeant Sophus has worked in the patrol division for 20 years. He is a Master Peace Officer’s and was promoted to the rank of sergeant in February of 2020.

Email:  ASOPHUS@houstonisd.org

Sergeant Ascencio began his career with the Harris County Constable Precinct 6 in July 2006 as a Reserve Deputy. In May 2008, he was employed by the Fort Bend County Sheriff's Office where he was assigned to the detention bureau. He was also assigned to the Special Response Team (SRT) and Field Training Team. Sergeant Ascencio began his tenure with the HISD Police Department in 2013 as a campus officer at Gregory Lincoln Education Center where he gained experience in campus operations and later transferred to patrol operations.  Sergeant Ascencio holds a Master TCOLE Peace Officer License, an Advanced Jailer Proficiency License, and over 4,400 hours of TCOLE training.

Email:  Jorge.Ascencio@houstonisd.org