Dallas County Sheriff


Lupe Garza Executive Chief Deputy Lupe Garza has 30 years of service and experience in law enforcement. She oversees the Office of Administration as well as the Internal Affairs Division, Quality Assurance Unit, and the Management Services Division. Previously she served as the Assistant Chief Deputy over the Investigative and Judicial Sections under the Office of General Services.

She began her law enforcement career as a state trooper with the Texas Department of Public Safety. In 1994, she was promoted to the position of sergeant investigator with the narcotics section. In that capacity, she investigated numerous complex narcotics investigations. In 1997, she was again promoted within the Department to the rank of lieutenant. As such, she supervised narcotics investigators and assisted with the implementation of investigative tactics for such cases, many with international connections.

Before retiring in August 2014, Chief Garza served as captain over the Intelligence and Counterterrorism Division based at DPS Headquarters in Austin. There, she oversaw the day-to-day operations of The Texas Joint Crime Information Center, and was involved with border security matters, which included interaction and cooperation with local, state and federal entities.

Chief Garza instructed numerous criminal justice courses as an adjunct professor at Texas State University, Laredo Community College and Texas A&M International University. As an instructor, she learned the value of working and mentoring the next generation of law enforcement officers.
  • Master's Degree in Criminology, Southwest Texas State, San Marcos, Texas
  • Bachelor's Degree in Liberal Arts, St. Edwards University
  • Associate Degree in Criminal Justice, Austin Community College
  • Drug Enforcement Administration National Drug Commanders School
  • Graduate of the Law Enforcement Management Institute of Texas
  • Graduate of the FBI National Leadership/Management Academy
  • Graduate of Senior Management Institute for Police (PERF)
  • Instructor’s Certification from the Texas Commission on Law Enforcement Officer Standards
  • Master’s Certification from the Texas Commission on Law Enforcement Officer Standards
Office of Administration – 214.653.2901

Patrick Bonner Chief Deputy Patrick Bonner began his career in law enforcement in 1992 as a detention officer with the Dallas County Sheriff’s Department.

He quickly ascended in rank, he was sworn in as a deputy sheriff in March of 1995, where he was assigned to Detentions, Warrant Execution, Freeway Management and Internal Affairs.

Chief Deputy Bonner promoted to the rank of senior sergeant in 2006. While in that rank, he served as a first-line supervisor in the Patrol and Traffic Division and later becoming the Administrative Senior Sargent with the responsibility of managing the Field Training Officer Program.

In 2012, he was promoted to Lieutenant and was assigned to the Technical Services Bureau. While assigned to Technical Services, Chief Deputy Patrick Bonner was assigned to manage the Dallas County Sheriff’s Department Honor Guard.

In April 2014, Chief Bonner was honored to be chosen as an Assistant Chief Deputy where he was assigned to the Resource Development Bureau.

In January 2018, Chief Bonner was promoted to the rank of Chief Deputy in charge of General Services.
  • Master of Arts in Professional Development – Dallas Baptist University
  • Bachelor of Arts and Sciences- Dallas Baptist University
  • 260th Session – FBI National Academy
  • 49th Management College – Institute for Law Enforcement Administration
  • 92nd School of Police Supervision – Institute for Law Enforcement Administration
  • Masters Peace Officer's License from the Texas Commission on Law Enforcement Standards and Education
Office of General Services – 214.653.3462

Fredrick Mark Robinson Chief Deputy Fredrick Mark Robinson oversees the Office of Detentions. He began his career in 1993 as a detention officer after honorably being discharged from the United States Army.

Chief Robinson was promoted to deputy sheriff in 1996. He worked in the jail and as a patrolman, as well as, a school resource officer in his tenure as a deputy.

In 2006, Chief Robinson was promoted to Lance Sergeant and then later the same year to Senior Sergeant. He worked in the Release Section, Patrol, and Traffic.

In 2013, he was promoted to Lieutenant. He served as shift commander in on all three shifts in Central Intake before being transferred the Bailiff Section.

In 2017, Chief Robinson was promoted to the rank of Captain. He was the division commander of Intake, Warrants, and Traffic/Patrol Divisions.

In 2018, Chief Robinson was promoted to Assistant Chief Deputy. He was the bureau commander of Technical Services until 2019.

In 2019, Chief Robinson was selected as Chief Deputy in charge of the Office of Detentions Administration.

  • Bachelors of Art Mass Communication – Southern Arkansas University
  • 50th School of Executive leadership – Institute of for Law Enforcement Administration
  • 100th School Of Police Supervision – Institute of for Law Enforcement Administration
  • Master Peace Officers License form the Texas Commission on Law Enforcement
  • U.S. Military - Honorably Discharged
Detention Administration – 214.653.2902

Gary McDaniel Assistant Chief Deputy Gary McDaniel is responsible for the Investigative and Judicial Sections. Chief McDaniel joined the Dallas County Sheriff’s Department in January 2018 after retiring from the Duncanville Police Department with 34 years of law enforcement service.

Chief McDaniel began his law enforcement career at Duncanville in 1983 as a Patrol Officer. During his service with Duncanville he rose through the ranks to Lieutenant and commanded several divisions. Those divisions included Criminal Investigation, Narcotics, Special Services and the SWAT Unit of which he was a founding member.

Chief McDaniel has also been involved in many community programs. For many years he was an Instructor and Alumni Liaison for one of the first Citizen Police Academy Programs in the State and a department coordinator for the Law Enforcement Torch Run benefiting Texas Special Olympics. Chief McDaniel assisted in creating a program to begin law enforcement partnerships with leaders of area Faith Based Organizations.
  • Master Peace Officer Certification from the Texas Commission on Law Enforcement
  • Instructors License from the Texas Commission on Law Enforcement
  • SWAT Commander certification, Texas A&M
  • Advanced Hostage Negotiation
  • 53rd School of Executive Leadership from the Institute for Law Enforcement Administration
  • Attended Richland College
  • Narcotics Task Force Officer with the Dallas Office of the Federal Bureau of Investigation (4 ½ years)
Investigative and Judicial Services – 214.653.3451

Debbie Foster Assistant Chief Deputy Debbie Foster is responsible for the Operation and Support Services at the Dallas County Sheriff’s Department. Chief Foster has 25 years of law enforcement experience working with agencies at the local, state and federal level.

In 1985, while attending Southwest Texas State University for three years to pursue an elementary education degree, Chief Foster joined the University Police Department as a patrol officer.  During her time serving as a patrol officer, Chief Foster discovered her passion for law enforcement and put her formal education on hold.

After three years, Chief Foster joined the Permian Basin Drug Task Force. Chief Foster was hired as an undercover investigator for the Task Force, which was based in Midland, Texas. The Task Force covered 17 counties. Chief Foster made numerous undercover buys, which resulted in many arrests as well as property and currency seizures. Chief Foster worked at the Ark-La-Tex Narcotics Task Force located in Linden, Texas, where she acted as the buying agent for covert undercover operations. She was later hired at the Southeast Texas Narcotics and Intelligence Task Force, located in Hardin County, Texas. Chief Foster worked as an undercover investigator until she was promoted to Assistant Commander of the Task Force. Chief Foster coordinated the drug task force, which included five counties. The Task Force worked closely with federal agencies such as the U.S. Customs, ATF, DEA, DPS and other police and sheriff's departments. In 2000, the new sheriff of Wood County, Texas hired Chief Foster as a sergeant/investigator to oversee the narcotic operations in the county. Chief Foster was later promoted to chief deputy. As the chief deputy in Wood County, she managed the daily operations of the sheriff's department, which included, patrol, criminal investigations, civil process and the daily operations of the jail. She also assisted with community relations throughout the county.
  • Graduate of the Federal Bureau of Investigation National Academy Class #270
  • University of Phoenix Bachelor of Science Degree with Honors in Criminal Justice Administration/Management
  • Graduate of Northwestern University School of Police Staff and Command School #383
  • Attended Southwest Texas State University in San Marcos, Elementary Education – three years
  • Attended Lamar University, Beaumont, Texas, Criminal Justice
  • Master Peace Officer Texas Commission on Law Enforcement Officer Standards and Education
  • Basic Jail Certification Texas Commission on Law Enforcement Officer Standards and Education
  • Texas, Office of the Governor, Narcotics Commander Management and Supervision Graduate
  • Bureau of Justice Assistance, Multijurisdictional Narcotics Task Force Management and Operations
Operation and Support Services – 214.653.3451

Don Rowe Assistant Chief Deputy Don E. Rowe is responsible for the Resource Development Bureau. Chief Rowe was born in Oak Cliff, Texas and graduated from Nimitz High School in Irving, Texas in 1981. He began his career with the Dallas County Sheriff’s Department as a detention service officer in 1982. He graduated the Deputy Academy in 1987, promoted to Sergeant in 1998, Lieutenant in 2006, Captain in 2008 and was promoted to Assistant Chief Deputy by Sheriff Marian Brown in 2018.
  • Attended Dallas Baptist University
  • 2016 graduate of the FBI National Academy Class 266 in Quantico, Virginia
  • Master Peace Officer’s License
  • Master Jailer’s License
  • Texas Commission on Law Enforcement Standards and Education Instructor
  • Medal of Valor recipient from the Dallas County Sheriff’s Department
  • Medal of Valor recipient from the State of Texas
Resource Development Services – 214.653.3451

Blaise Mikulewicz Assistant Chief Deputy Blaise Mikulewicz oversees the Detentions Special Services Bureau and brings over 30 years of law enforcement experience. Mikulewicz most recently served as chief deputy for the Denton County Sheriff's Office where he oversaw the department's daily operations and participated in long and short range planning for patrol, investigative and the correctional facilities. Prior to that, he served a 23-year career with the Federal Bureau of Investigation. Mikulewicz received his appointment to the FBI as a Special Agent in 1988.

Mikulewicz was transferred to the Dallas Division in 1999, as the Supervisory Special Agent of the Domestic Terrorism Squad during which time he played a significant role in the FBI's efforts to expand the North Texas Joint Terrorism Task Force. In 2000, Mikulewicz was given the responsibility of supervising a multi-agency High Intensity Drug Trafficking Area (HIDTA) Task Force which targeted large-scale narcotics groups within the Dallas-Fort Worth Metroplex. Under the supervision of Mikulewicz, the HIDTA Task Force was recognized for its efforts and received several regional Organized Crime Drug Enforcement Task Force (OCDETF) awards, as well as two national awards from the Executive Office of the President, Office of National Drug Control Policy (ONDCP), HIDTA.

Mikulewicz was promoted to the rank of Assistant Special Agent in Charge for the Dallas Division of the FBI in 2005 and provided Executive Management for Supervisors, Special Agents, Task Force Officers and support personnel working various criminal matters. He directed the day-to-day operations for multiple Drug and Violent Crime Task Forces located within the Dallas Division.
  • Bachelor's Degree in Forestry - Multiple Resource Management, Northern Arizona University, Flagstaff, Arizona
Detentions Special Services Bureau – 214.653.2601

Jason Hargraves Assistant Chief Deputy Jason Hartgraves oversees the Technical Services Bureau. He began his career with the Dallas County Sheriff’s Department as a detention service officer in 1990. He became a deputy in 1993 rising through the ranks to Captain prior to his appointment as Assistant Chief Deputy in 2013, and Chief Deputy in 2018.
  • Master of Science in Management- Texas A&M University-Commerce
  • Bachelor of Arts and Science- Dallas Baptist University
  • Graduate Certificate in Criminal Justice Management- University of Virginia
  • FBI National Academy 231st Session
  • 42nd Management College-Institute for Law Enforcement Administration
  • 81st School of Police Supervision- Institute of Law Enforcement Administration
  • Master Peace Officer’s License from the Texas Commission on Law Enforcement Standards and Education
  • Master Jailer License
  • Certified Correctional Healthcare Professional (CCHP) National Commission on Correctional Health Care
Technical Services Bureau – 214.653.2601

Elizabeth Lutton The Dallas County Sheriff’s Department Legal Advisor Elizabeth Lutton provides counsel to Sheriff Marian Brown and department employees internally. She previously worked for the City of Arlington as a senior attorney and the City of Odessa as a senior assistant city attorney. Her area of practice is local government employment law and she has over 25 years of experience in labor and employment law, as well as police procedure.
  • Doctor of Jurisprudence Degree – Texas Tech University
  • Master's Degree in Business Administration
  • Bachelor’s Degree in Business Administration
  • Board certified by the Texas Board of Legal Specialization in labor and employment law
Legal Advisor – 214.653.3453