the Attorneys at Sullivant Slack Law Firm in Gainesville TX

  Larry Sullivant is a distinguished legal professional with a career spanning over five decades. A graduate of the University of North Texas (BA, 1963) and Baylor Law School (Doctor of Jurisprudence, 1966), he was admitted to practice before the U.S. District Court, Northern District of Texas. His commitment to justice led him to serve as County Judge of Cooke County (1970-76) and District Judge of the 235th Judicial District Court (1976-88).

As a Partner at Sullivant Law Firm since 1989, Larry has built a legacy of excellence, earning the prestigious AV Preeminent rating from Martindale-Hubbell—recognizing his ethical standards and legal expertise—for over 20 years. A respected member of the Cooke County and North Texas Bar Associations, the State Bar of Texas (serving on the District 14-B Grievance Committee from 2001-07), and the Texas Trial Lawyers Association, Larry remains a pillar of the legal community.

In addition to his litigation experience, he offers mediation services as a Certified Mediator, bringing his deep legal insight and impartial judgment to dispute resolution.

  Bill Sullivant is a distinguished legal leader with a legacy of service and excellence spanning over six decades. A graduate of the University of Texas (BA, 1961) and the University of Texas Law School (Doctor of Jurisprudence, 1963), he was admitted to practice by the Supreme Court of Texas that same year. His career reflects an unwavering commitment to justice, beginning as Cooke County Attorney (1965-71) and advancing to District Attorney of the 235th District (1971-72). He then served as a Texas State Representative for the 23rd District (1973-1981), shaping legislation with integrity and dedication.

A leader in the legal community, Sullivant served as President of the Cooke County Bar Association (1968) and as a member of the State Bar of Texas District 14-B Grievance Committee (1995-2001). Since 1988, he has been a distinguished member of the College of the State Bar of Texas. Recognized for his legal prowess and ethical leadership, he has earned the prestigious AV Preeminent rating from Martindale-Hubbell for over 40 years—one of the highest honors in the legal profession.

Bill Sullivant was the Managing Partner of Sullivant Law Firm, LLP in Gainesville, TX, from 1977 until 2024, where his experience, leadership, and dedication to justice made a lasting impact.

  As a prosecutor, Barron Slack committed his professional career to courtroom advocacy and high-stakes litigation. Barron has successfully tried criminal cases ranging from traffic violations to numerous aggravated sexual offenses, murders, and capital murders. He has worked in this capacity both as lead counsel for the State of Texas and as counsel for the defense. He personally supervised hundreds of serious felony offenses, trained dozens of prosecutors, and was typically the first call made by State or Federal Law Enforcement Officials investigating cold case murders, child murders, and multiple victim capital offenses.

Barron has handled cases that made national news and understands the concerns, both legal and emotional, of citizens accused and their families. He brings a level of professional experience to your case that can prove extremely valuable if you are under investigation, looking for sound advice regarding the merits of your case, or if you need effective jury trial representation.

Barron was raised in North Texas and graduated from Texas Tech University School of Law in 2005. He spent 18 years in the Lubbock County District Attorney’s office. Barron is married to his lovely wife, Jennifer, also an attorney, and they have two daughters.

   Jennifer Slack has a wide variety of legal experience, ranging from criminal defense, criminal prosecution, expunctions and nondisclosures, contract law, and government law.

During her 18 years with the Lubbock County Criminal District Attorney’s Office, she devoted an entire decade to cases specific to family violence. She handled misdemeanor cases ranging from terroristic threat, harassment, and domestic violence all the way to felony cases, such as strangulation, kidnapping, aggravated assault, and sexual assault. She represented victims of family violence in court by obtaining protective orders. While working in the Domestic Violence Unit, she collaborated with many advocacy organizations and law enforcement agencies. She was also a committee member for the South Plains Association of Government Criminal Justice Advisory Committee for six years, holding the vice-chair position for two years.

In late 2018, Jennifer joined the civil division of the Lubbock County Criminal District Attorney’s Office.  As legal counsel for Lubbock County, she advised department heads and elected officials, handled contracts and Public Information Act requests, and assisted in civil litigation for the county.  She worked closely with the medical examiner’s office, the sheriff’s office, commissioners court, and other major departments within Lubbock County and has represented Lubbock County in federal court.

Jennifer was raised in a small town in west Texas and graduated from Texas Tech University School of Law in 2006. She spent 18 years in the Lubbock County Criminal District Attorney’s Office.