Dallas County Sheriff


Click here for the Dallas County Sheriff's Department Organization Chart

Jesse Flores Executive Chief Deputy Jesse Flores retired from the Waco Police Department before joining the Dallas County Sheriff's Department in November 2005. He brings 32 years of law enforcement experience to the department and the citizens of Dallas County. Chief Flores' goal is to serve the community in a fair and compassionate manner.
  • Master's Degree in Public Administration, Southwest Texas State,
    San Marcos, Texas
  • Bachelor's Degree in Criminal Justice, Baylor University
  • Medal of Valor , Waco Police Department
  • Associate Degree in Criminal Justice, McLennan Community College
  • Associate Degree in Airframe / Powerplant
Office of Administration – 214.653.2901

  Chief Deputy Marian Brown has over 26 years of service in law enforcement. She will serve as Chief Deputy over General Services.

She began her career with the Duncanville Police Department where she most recently served as the assistant chief. During her tenure, she served in the patrol division, community relations/crime prevention, as well as criminal investigations.
  • Bachelors of Arts Degree -- University of Texas at Arlington
  • Master Peace Officer Certification
  • Graduate of the International Law Enforcement Institute’s Management College
  • Graduate of the FBI National Academy Associates Command College
Office of General Services – 214.653.3451

Debbie Foster Assistant Chief Deputy Debbie Foster is responsible for the Investigative and Judicial 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.
  • University of Phoenix (anticipated graduation May 2015) Bachelors of Science,
  • Criminal Justice Administration and Management
  • 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
Investigative and Judicial Services – 214.653.3451

Patrick Bonner Assistant Chief Deputy Patrick Bonner oversees Operations and Support Services. He began his career with the Dallas County Sheriff's Department as a detention service officer in 1992. He rose through the ranks by becoming a deputy in 1995 a senior sergeant in 2006 and a lieutenant in 2012.
  • Bachelors of Arts and Science - Dallas Baptist University
  • Masters of Arts in Professional Development – Dallas Baptist University
  • 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
Operation and Support Services – 214.653.3451

Blaise Mikulewicz Chief Deputy Blaise Mikulewicz oversees the detentions administration 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, thie 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 Administration – 214.653.2902

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. He most recently served as captain over the department’s internal affairs division.
  • Masters of Science in Management – Texas A&M University-Commerce
  • Bachelors 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 for Law Enforcement Administration
  • Grant Management – Grant Writing USA, Inc.
  • Masters Peace Officer's License from the Texas Commission on Law Enforcement Standards and Education
Technical Services Bureau – 214.653.2601

Jesse Herrera Assistant Chief Deputy Jesse Herrera oversees the Inmate Housing Bureau. He began his law enforcement career in 1981 as a detention service officer with the Dallas County Sheriff’s Department. He was promoted to deputy sheriff in 1985; became sergeant in 1991; then lieutenant in 1994; and captain in 1999.

It was a historic milestone when Chief Herrera became assistant chief deputy in 2001. He became the first Hispanic in the department’s history to fill that position. He also is the first entry-level detention service officer, as a civilian, to be promoted to assistant chief deputy.
  • Associate's Degree in Police Science
  • Bachelor's Degree in Criminal Justice
  • 1996 graduate of the FBI National Academy in Quantico, Virginia
  • Basic Jailer, and Basic, Intermediate, Advanced, and Masters Peace Officer's License from the Texas Commission on Law Enforcement Standards and Education
  • Instructor's Certificate from the Texas Commission on Law Enforcement Standards and Education
  • Texas Army National Guard from December 1980 until December 1985
Inmate Housing Bureau – 214.653.2601

Earnestine Sanders Assistant Chief Earnestine Sanders oversees the Detention Special Services Bureau. She began her law enforcement career in 1989 as a detention service officer with the Dallas County Sheriff’s Department. She became a detention training officer in 1990; was promoted to detention service supervisor (sergeant) in 1993; then detention service manager (lieutenant) in 1999; and detention service commander (captain) in 2009.

Chief Sanders made Dallas County Sheriff’s Department history by becoming the first non-sworn assistant chief in May 2014. She was also the first ever non-sworn officer promoted to the position of captain.
  • Graduate of Business College
  • TCLEOSE Certified Ethics Instructor
  • TCLEOSE Certified Instructor
  • Basic, Intermediate, Advance, and Master Jailers Proficiency License from the Texas Commission on Law Enforcement Standards and Education
  • 2nd National Jail Leadership Command Academy Graduate – Correctional Management Institute of Texas
Special Service Bureau – 214.653.2601

Darryl D. Thomas Chief Financial Officer Darryl D. Thomas has over three decades of experience in the public and private sectors of accounting:  financial and performance audits, governmental/non-profit, oil and gas, taxation, banking, information technology, management and staff supervision and teaching and training.  In 1999, he became the chief financial officer for the Dallas County Sheriff’s Office.  He manages a $143 million annual budget and serves as liaison to the Dallas County Commissioners Court.
  • Certified Public Accountant
  • Bachelor of Business Administration – Accounting
Management Services Division – 214.653.2763

Elizabeth Lutton The Dallas County Sheriff’s Department Legal Advisor Elizabeth Lutton provides counsel to Sheriff Lupe Valdez and the department employees internally. She has 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