Police Chief
James (Jim) Lowery, Jr., joined the Schertz Police Department as Chief of Police in June 2022. Previously, Chief Lowery worked for the Arlington Police Department for 39 years, where he began his law enforcement career in March of 1983. He has served in a multitude of positions during his tenure as he rose to the rank of Assistant Chief. Chief Lowery has a Master of Science in Strategic Leadership and a Bachelor of Science in Organizational Leadership from Mountain State University in Beckley, WV. His father served in and retired from the US Air Force. He has lived in several countries during his youth, including the Philippines and Germany, among other stateside locations. He graduated from Radford High School, Honolulu, HI, in 1980.
Chief Lowery holds a Master Peace Officer and Police Instructor’s License from the Texas Commission on Law Enforcement (TCOLE) and has over 9,000 certified hours of TCOLE career and professional training credit. He is a graduate of the prestigious FBI National Academy (class #259), Senior Management Institute for Police (SMIP), and the Bill Blackwood Law Enforcement Management Institute of Texas (LEMIT). During his career with Arlington PD, he has been issued numerous awards that include the Distinguished Service Award (3x’s), Life-Saving Award (3x’s), Community Service Award (3x’s), Police Officer’s Award, Medal of Merit, SWAT Award, and Honor Guard Award. Chief Lowery firmly believes that Law Enforcement is one of the most noble and honorable professions one can be called upon in which to serve. And that effective, professional, and progressive law enforcement is a profession built upon transparency and collaborative relationships. Chief Lowery fully understands that being a first responder can be a rewarding job, but it can be overly mentally taxing, and he is determined to promote officer wellness and safety programs.
Jim and his wife, Randi, have two daughters and one grandson. He enjoys the outdoors, which includes his favorite pastime of playing golf. Jim is deeply involved in community events and participates as a volunteer with various organizations.
Assistant Chief Daniel Roman
Assistant Chief Daniel Roman started his career in the Schertz Police Department in 2007 as a patrol officer after serving as a detention officer at the Bexar County Jail for two years. During his tenure at the Schertz Police Department, he has risen to the rank of Assistant Chief. Over the past seventeen years, he has held various positions, including field training officer, accident reconstructionist, SWAT officer, and criminal investigator. In 2020, he was promoted to Lieutenant and took charge of patrol operations. Two years later, he was promoted to Assistant Chief of Police and assigned to the Field Operations Bureau, overseeing the Uniform Services and Central Investigation divisions. Recently, the department went through a reorganization, and he was reassigned to the Operations Support Bureau, which oversees central investigations, support services, and professional standards divisions.
Assistant Chief Roman is a highly qualified law enforcement professional who holds a Master Peace Officer Certification. He has a bachelor’s degree in Criminal Justice and is currently pursuing a master's degree in Public Safety through the University of Virginia. Additionally, he is a United States Marine Corps veteran and served eight years as a military policeman. Assistant Chief Roman is firm believer in community-based policing and has the wherewithal to understand that law enforcement is a customer service and relationship-based profession. His leadership philosophy subscribes to a viewpoint strongly based on leading by example and procedural justice.
Recently, Assistant Chief Roman graduated from the FBI National Academy (Session 289) in Quantico, VA. He is scheduled to begin his training at the Bill Blackwood Law Enforcement Management Institute of Texas (LEMIT) in October 2024.
Assistant Chief Phillip Waller
Assistant Chief Phillip E. Waller joined the Schertz Police Department in September 2024, bringing with him decades of experience and a distinguished career in law enforcement. Prior to his current role, Assistant Chief Waller dedicated over twenty-one years of service to the Bradenton Police Department in Florida, where he recently retired as Captain of Patrol Operations. His tenure at the Bradenton Police Department was marked by a diverse range of responsibilities and achievements, reflecting his deep commitment to both community safety and professional development.
Throughout his career at Bradenton, Assistant Chief Waller undertook numerous roles that spanned various facets of law enforcement. His experience includes traffic enforcement, patrol operations, street-level narcotics enforcement, and criminal investigations. He also held several supervisory positions, demonstrating his leadership capabilities and his ability to handle complex situations. His contributions to the department were widely recognized; he earned several commendations for his innovative community policing initiatives and received the Distinguished Service Award in acknowledgment of his relentless efforts to enhance departmental operations and better serve both the community and his colleagues. His accolades also include the Medal of Merit, the Unit Commendation Award, and several Officer of the Month recognitions, underscoring his consistent performance and dedication throughout his career.
Academically, Assistant Chief Waller holds a Bachelor of Applied Science in Public Safety and Emergency Management from the State College of Florida, where he specialized in Homeland Security. His commitment to leadership development is evident from his graduation from the Florida Leadership Academy, hosted by the Florida Department of Law Enforcement (Class 42). He has also pursued various leadership and management courses and served as an instructor on several high-liability topics, further showcasing his expertise and commitment to training and professional growth.
Originally from Beaumont, Texas, Assistant Chief Waller relocated to Florida in the late 1990s after a brief period in New Orleans, Louisiana. His ties to Texas run deep, as his family has been part of the Hill Country community since the 1980s. After spending many summers in the area, he is excited to call it his new home. Outside of his professional life, he enjoys engaging in physical fitness, exploring different historical periods, and following baseball. With a supportive family, including his wife Kristin and their two children, Assistant Chief Waller is looking forward to contributing to and growing with the Schertz Police Department.
Lt. Darin LaCour
Lieutenant Darin S. LaCour began his career with the Schertz Police Department in 1994 as a reserve patrol officer, then was hired as a full-time patrolman in 1995. Throughout his professional career, Lieutenant LaCour served the department as a patrol officer, narcotics detective assigned to the Drug Enforcement Administration, DEA Special Response Operator, and investigator while advancing through the ranks.
In 2022, Lieutenant LaCour was appointed to Lieutenant and now currently serves as the Support Division Commander overseeing Community Projects, Communication (Dispatch), Records, Information Technology, School Resource Officers, Traffic Unit, and Recruiting.
Lieutenant LaCour maintains a Master Peace Officer Certification. Lieutenant LaCour possesses an Associate of Applied Sciences degree, is a senior in college, and is a veteran of the United States Air Force. Lieutenant LaCour served in the armed forces for over 34 years, attaining the rank of Command Chief Master Sergeant, 149th Fighter Wing, Texas Air Guard.
Lt. Kelly Kallies
Lieutenant Kelly Kallies began her career with the Schertz Police Department in September 2007. Lieutenant Kallies served as a Patrol Officer and then transferred to the Criminal Investigations Unit, serving as a Detective, Detective Corporal, Evidence Technician, and Evidence Technician Supervisor. Lieutenant Kallies is the pioneer of the Polygraph Unit within the Schertz Police Department, as she was the first State Board Certified Polygraph Examiner for the Department. Since being promoted to Lieutenant, she has overseen numerous units within the Department, including Communications, Records, School Resources, Information Technology, Animal Services, Criminal Investigations, Evidence Technicians / Crime Scene, and her current assignment of Patrol.
Lieutenant Kallies holds a Master Peace Officer License. She is a graduate of the Bill Blackwood’s Law Enforcement Management Institute of Texas (LEMIT) Leadership Command College (LLC) class #88 and is award recipient #67 of the Law Enforcement Command Officer Program (LECOP) through the Texas Police Chiefs Association. Lieutenant Kallies holds a Bachelor’s of Science in Criminal Justice and a Master’s degree in Management and Leadership from Tarleton State University.
Lt. Dallas Hopper
Lieutenant Dallas Hopper joined the Schertz Police Department in October 2012. During his career, he has served in several roles within the Patrol Division. As a patrol officer, he became a Field Training Officer and earned certifications as a Basic TCOLE Instructor, Firearms Instructor, and Taser Instructor.
In June 2021, Lieutenant Hopper was promoted to Corporal and assigned to Night Shift "A" Patrol. In October 2023, he was promoted to Sergeant, where he continued supervising patrol officers on Night Shift "A."
In March 2026, Lieutenant Hopper was promoted to Lieutenant and now serves as the Support Services Division Commander. In this position, he oversees Community Projects, Communications (Dispatch), Records, Information Technology, School Resource Officers, the Traffic Unit, and Recruiting.
Lieutenant Hopper holds a Master Peace Officer License and earned a Bachelor of Arts degree in Sociology from Texas Lutheran University.
Lt. Marty Treviño
Marty Treviño, Sr. serves as a Lieutenant with the Schertz Police Department, currently assigned as the Professional Standards Division Commander. Lieutenant Treviño joined the Schertz Police Department in 2004 and has served the agency in multiple roles throughout his career.
Lieutenant Treviño has worked in a wide range of assignments, including Patrol Officer, Field Training Officer (FTO), Detective in the Criminal Investigations Division, and Motor Officer. He has also served as an FTO Coordinator, Honor Guard member, and SWAT Operator. His leadership roles include serving as a Patrol Corporal (2009), Patrol Sergeant (2011–2013 and 2014–2018), Investigations Sergeant (2013–2014), and School Resource Officer (SRO) Sergeant from 2018 to 2024. In November 2024, he was promoted to the rank of Lieutenant.
Lieutenant Treviño holds a Master Peace Officer License from the Texas Commission on Law Enforcement (TCOLE). He is a Certified Motor Officer, Certified Advanced SWAT Operator, Certified School Resource Officer, and Certified ALERRT Level 1 Instructor. In 2015, he graduated from the prestigious Northwestern University Center for Public Safety’s School of Police Staff and Command. He is currently pursuing his Bachelor of Arts in Criminal Justice Administration at Tarleton State University.
Lieutenant Treviño believes in the importance of law enforcement professionals maintaining high levels of fitness and readiness, recognizing that optimal performance leads to excellent service for the community. He is committed to officer development, accountability, and community engagement.
Born and raised in San Antonio, Texas, Lieutenant Treviño is a second-generation law enforcement officer, following in the footsteps of his father, who also served in law enforcement.
In his role as Professional Standards Division Commander, Lieutenant Treviño provides leadership and oversight for:
- Internal Affairs
- Training and Professional Development
- Quartermaster and Equipment Logistics
- Recruitment and Applicant Processing
- Animal Control Services