Dean Dittmann began his IT career over two and a half decades ago in the private sector as an end user support technician. Working for a small business, he worked his way through the ranks from service to sales and eventually becoming the location manager in California’s Central Valley. Seeking a new challenge, Dean joined a start-up company specializing in data services, telephony and converged networks. While with this company, Dean carried out a variety of roles doing everything from pulling cable to programming complex phone systems and configuring converged networks supporting computer-telephone integration. When presented with the opportunity to work for a Fortune 50 company, Dean left the startup and joined PepsiCo where he honed his skills managing enterprise-wide IT and network projects eventually serving as Senior Technician in the California region.

Assistant Chief Emily Hammond began her probation career in 2001 with the Stanislaus County Department. She was hired by the San Joaquin County Probation Department in 2022.

During her career, she has held a number of positions and has had the opportunity to work a variety of assignments, including High-Risk supervision, Courts, Investigations, and School Resource Officer assignments. She has supervised teams of officers in High-Risk Field Supervision, School Resource assignments, Backgrounds, Internal Affairs and grant projects. As a director, she managed Adult Probation, Community Corrections Partnerships, and Juvenile Institutions.

She was instrumental in developing a Narcan program for probation staff, expanding evidence programs, developing a community partnerships team and developing a Division of Juvenile Justice (DJJ) Realignment Program.

Assistant Chief Hammond was previously selected for the Probation Officer of the Year and Supervisor of the Year awards. She obtained her Bachelor’s Degree in Criminal Justice from California State University, Stanislaus and has received a number of professional certifications.

Assistant Chief Hammond strongly believes in promoting positive change, making victims whole, and keeping our community safe.

Michael Laughlin holds a master’s degree in counseling/guidance and is a former Senior U.S. Pretrial/Probation Officer/Specialist, later serving as a County Manager over Jail Diversion, Pretrial, and Criminal Justice systems in multiple jurisdictions. He is the past President of Texas Association of Pretrial Services and currently serves on the Professional Development Committee. Additionally, Mr. Laughlin is a Licensed Professional Counselor-Supervisor, Licensed Chemical Dependency Counselor, and nationally Certified Pretrial Release/Diversion Professional, as well as a Global Career Development Facilitator and Offender Workforce Development Specialist-Instructor.

Vik Manne is the a passionate and innovative enterprise security architect and Artificial Intelligence (AI) researcher with extensive experience helping organizations succeed in complex technology initiatives. As a former Chief Technology Officer and Chief Information Security Officer, he provides mission-critical technical leadership across enterprise architecture, cybersecurity, and digital transformation.

Ashley Martin has 19 years of experience with the South Carolina Department of Probation, Parole, and Pardon Services. She began her career as a field probation agent supervising high-risk populations and later served as a subject matter expert in evidence-based assessments, supervision planning, and violation decision-making. She currently serves as an Evidence-Based Analyst, where she supported an artificial intelligence pilot by developing business metrics, training managers, and overseeing auditing and data management processes. Her work focuses on aligning emerging technologies with evidence-based practice, operational realities, and realistic implementation expectations. Ashley holds a master’s degree in Forensic Psychology and served six years in the United States Marine Corps Reserve.

Brian Passenheim began his career with the Placer County Probation Department in 2004 as a Deputy Probation Officer, starting at the Juvenile Detention Facility. A graduate of Woodcreek High School in Roseville, California, Brian launched his career as a Correctional Officer with the Brookings County Detention Center in South Dakota. He earned a Bachelor of Arts in Sociology from South Dakota State University in 2001, with minors in Criminal Justice and Spanish. Following his undergraduate studies, Brian served as a Parole Agent with the South Dakota Department of Corrections before returning to California to continue his public service. Throughout his tenure at the Placer County Probation Department, Brian has promoted through every rank, demonstrating strong leadership and a commitment to excellence. He served as Assistant Chief Probation Officer from 2021 until his appointment as Chief Probation Officer in March 2025. In addition to his leadership roles, he has held a wide range of responsibilities including Background Investigator, Field Training Officer, Public Information Officer, Safety Officer, Co-Coordinator of the CSEC team, and Evidence Room Manager. In 2023, Brian earned a Master of Science in Law Enforcement and Public Safety Leadership from the University of San Diego. Brian is passionate about serving the community and is honored to lead the department in its mission to enhance public safety, promote rehabilitation, and support positive change throughout Placer County.

Cristel Tullock, is the Chief of the San Francisco Adult Probation Department. Chief Tullock holds a MSW and a BA in Criminology and Corrections. With 25 years of experience in community corrections, she has trained with Kaiser Permanente's Psychiatry Department and contracted with California’s Mental Health Department to develop reentry strategies for sex offenders. Her expertise spans local, state, and national criminal justice reforms, and she has led a variety of programs designed to help justice-involved individuals rebuild their lives. Among her many accolades, she received the San Francisco District Attorney’s Victim Services Award from Kamala Harris in 2007. Additionally, she graduated from the APPA Leadership Institute in 2016 and is an active member of both the APPA AI Committee and the APPA Technology Committee.

Michael Laughlin holds a master’s degree in counseling/guidance and is a former Senior U.S. Pretrial/Probation Officer/Specialist, later serving as a County Manager over Jail Diversion, Pretrial, and Criminal Justice systems in multiple jurisdictions. He is the past President of Texas Association of Pretrial Services and currently serves on the Professional Development Committee. Additionally, Mr. Laughlin is a Licensed Professional Counselor-Supervisor, Licensed Chemical Dependency Counselor, and nationally Certified Pretrial Release/Diversion Professional, as well as a Global Career Development Facilitator and Offender Workforce Development Specialist-Instructor.

Before joining Tyler, Ellen Reed spent 10 years working in the legal system in various roles as a private paralegal, a pro bono program coordinator with the King County Bar Association, and a program lead at the Washington State Bar Association. She started working with Tyler in 2020 as a product analyst and is currently the Director of the Justice Data Team in the Data & Insights division. Ellen’s team focuses exclusively on building data and analytics products for courts and public safety agencies; daily activities include working directly with court and public safety personnel to identify key performance indicators, model and validate data, use data in strategic decision-making, connect data from diverse source systems, and develop advanced analysis capabilities.

In 2021, Ellen earned a Master of Science degree in Human-Centered Design and Engineering from the University of Washington School of Engineering. Outside of Tyler, Ellen teaches Legal Technology in an ABA-approved paralegal program and is active in many legal regulatory boards and committees. Current affiliations include Washington state’s Access to Justice Technology Committee and the Practice of Law Board.

Brian Passenheim began his career with the Placer County Probation Department in 2004 as a Deputy Probation Officer, starting at the Juvenile Detention Facility. A graduate of Woodcreek High School in Roseville, California, Brian launched his career as a Correctional Officer with the Brookings County Detention Center in South Dakota. He earned a Bachelor of Arts in Sociology from South Dakota State University in 2001, with minors in Criminal Justice and Spanish. Following his undergraduate studies, Brian served as a Parole Agent with the South Dakota Department of Corrections before returning to California to continue his public service. Throughout his tenure at the Placer County Probation Department, Brian has promoted through every rank, demonstrating strong leadership and a commitment to excellence. He served as Assistant Chief Probation Officer from 2021 until his appointment as Chief Probation Officer in March 2025. In addition to his leadership roles, he has held a wide range of responsibilities including Background Investigator, Field Training Officer, Public Information Officer, Safety Officer, Co-Coordinator of the CSEC team, and Evidence Room Manager. In 2023, Brian earned a Master of Science in Law Enforcement and Public Safety Leadership from the University of San Diego. Brian is passionate about serving the community and is honored to lead the department in its mission to enhance public safety, promote rehabilitation, and support positive change throughout Placer County.

Dean Dittmann began his IT career over two and a half decades ago in the private sector as an end user support technician. Working for a small business, he worked his way through the ranks from service to sales and eventually becoming the location manager in California’s Central Valley. Seeking a new challenge, Dean joined a start-up company specializing in data services, telephony and converged networks. While with this company, Dean carried out a variety of roles doing everything from pulling cable to programming complex phone systems and configuring converged networks supporting computer-telephone integration. When presented with the opportunity to work for a Fortune 50 company, Dean left the startup and joined PepsiCo where he honed his skills managing enterprise-wide IT and network projects eventually serving as Senior Technician in the California region.