Board of Trustees Bios

Les Black

Les Black

Background and Education
Les Black is a native Texan and life-long educator who moved to Farmers Branch in 1998.  He grew up in Denton, TX, where his parents both served on faculty at the University of North Texas. After completing his K-12 education in the Denton public schools, he enrolled in the University of North Texas, earning a Bachelor of Arts in German, a Master of Arts in Educational Administration, and eventually a Ph.D. in Educational Administration with a focus on education law and policy. 

Public Service
In addition to CFBISD Board service, Dr. Black is on the board of directors of the Denton High School Family Assistance Foundation, a non-profit foundation that provides financial assistance to Denton High School students, families, staff or alumni experiencing sudden financial stress. He has been a PTA volunteer and has also served on the City of Dallas Welcoming Communities Task Force.  

Professional and Personal
Dr. Black is currently a Professor of Education Policy and Leadership in the Annette Caldwell Simmons School of Education and Human Development at Southern Methodist University. Prior to his work at SMU, Dr. Black was a public-school teacher and administrator, including 15 years in Carrollton-Farmers Branch. As a legal scholar, he has authored several law review articles and book chapters examining the evolving expression rights of public-school students and employees in the digital age. Dr. Black and his wife Emily have two children - a daughter in her third year at SMU, and a son who is a senior in high school. When he’s not involved with his work at SMU or service in CFBISD, Dr. Black enjoys running, playing guitar, and watching Dallas Maverick basketball.

Randy Schackmann

Randy Schackmann

Background and Education
Randy Schackmann is a native Oregonian with strong Texas roots (his Mom and Grandparents were “Lone Star staters”). He grew up and attended school in Portland, except for two years when his Mom, a teacher, took a one-year assignment in Hawaii and later Taipei, Taiwan. After high school, Randy was recruited to a small, private, Christian college in Portland on a combined academic and athletic scholarship. He earned both an A.A. and B.A. degree with double majors in Liberal Arts and Religion. He later went to Pepperdine University on a full presidential scholarship to do his M.S. in ministry.

Public Service
Randy has always been very active in his community, public education, and church. Over the years, his involvement includes time on several chambers of commerce, including tenure on their boards of directors. In addition, he filled a term on the Farmers Branch Employees Salary and Retirement review committee, directed the Dallas area Dash-For-Dignity 5K (supporting adults with disabilities) for two years, and was a member of the Governor’s School Earthquake Safety review committee. He has been active in local PTAs and volunteered as a board member on multiple campuses. He served on both campus and district-level advisory committees and has been involved in numerous school booster groups. In addition to serving as a CFBISD elected trustee (in his 9th year), he is currently a member of the Board of Regents for Nations University, and he is an active fundraising advisor for several local nonprofits.

An ordained preacher, Randy spent the first fifteen years after college working at a local church in Glendale, California, where he became the senior minister for eight years. He maintains his ministerial license and does some fill-in preaching for area churches and occasional weddings or funerals.

Professional and Personal
A midlife career shift found Randy working in church relations and fundraising for a California, faith-based senior-care facility. This change led to a growing nonprofit management role as a fundraising account executive, a senior vice president at Caswell Zachry, Grizzard, a national firm, and the owner of his own boutique consulting firm, Schackmann Philanthropy Support, LLC. In 2007, he moved to North Texas. While doing nonprofit work, he went back to school to receive an industry certification at Indiana University’s School of Philanthropy and a charitable estate planning credential from the National Planned Giving Institute through the Law School at William & Mary. Additionally, He also earned the prestigious CFRE professional certification. His consulting work helped raise nearly $400,000,000 for numerous organizations, including multiple Association of Gospel Rescue Missions (homeless care facilities), Salvation Army, Hospice, Food Banks, Red Cross, MD Anderson, and more. He has helped train boards and staff alike at some 200 successful nonprofits throughout the country. Randy sold his consulting firm in 2017 and is officially, happily, retired.   

Cassandra Hatfield

Cassandra Hatfield

Background and Education
Mrs. Hatfield grew up in Texas public schools and was raised in Rockwall. Early in her career she lived in Carrollton and then returned with her family in 2016, in anticipation of her two children attending CFBISD schools. She earned her Bachelor of Science in Interdisciplinary Studies with a Texas teaching certification in 4th – 8th grade mathematics from Texas A&M University – Commerce. Later in her educational career she went on to earn an M.Ed. in Leadership of Learning with a K-12 Principal certification, an ESL certification and a specialization in conflict resolution. Additionally, she has taken additional coursework to round out a Kinder -4th grade master math teacher certification, with an emphasis in coaching.

Public Service
Mrs. Hatfield was elected to the Carrollton-Farmers Branch ISD Board of Trustees in May 2021. Before serving as a Trustee, she served a one-year term on the District Improvement Council and a Campus Improvement Committee. Additionally, she has served on her children’s school PTA as the Vice President of Ways and Means, Vice President of Membership, Chair of the Family STEM Night and Science Fair, along with various other committees.  Outside of the district, Mrs. Hatfield has served on the Girl Scouts of Northeast Texas STEM Advisory Board and is a Troop Cookie Manager for a local Girl Scout troop.

Professional and Personal
Mrs. Hatfield is currently a Research Project Manager at Southern Methodist University. In this role she has managed more than a dozen corporate, state, and federal STEM education research grants focused on assessment development or teacher and leader training. Her primary responsibility is to develop and oversee the day-to-day operations of each grant by designing project scopes and timelines, collaborating with personnel, and ensuring the projects produce high quality research on time and in budget. Prior to SMU, Mrs. Hatfield spent 8 years in public education in various roles, including teaching elementary and middle school mathematics. She was also a mathematics specialist, supporting teachers through coaching, providing training workshops, and analyzing data to support the identification of instructional goals. Three of her years in public education were spent in CFBISD supporting between five and nine campuses. Outside of work, you can find Mrs. Hatfield actively engaged in her children’s activities, which include Girl Scouts, theater and sports. She hopes that one day she can find time to return to her prior hobby of scrapbooking so that all of her pictures don’t just live on her iCloud.

Sally Derek

Sally Derrick

Background and Education
Sally is a lifelong resident of CFB, having grown up in Carrollton before moving to Farmers Branch over 20 years ago. She received an Associate’s Degree of Nursing from Brookhaven College in 2001 and then went on to receive her Bachelor’s Degree of Science in Nursing from the University of Arlington in 2003, where she graduated Cum Laude.

Public Service
Before serving on the School Board, Sally served for over a decade on multiple Farmers Branch Boards and Commissions. She served as the Chair of the Family Advisory Board and also served as an active member on the Library Board, Community Watch Committee and the Charter Review Committee. 

Sally became involved in our schools through PTA where she first began serving in 2009. She has served as the PTA President at Janie Stark Elementary, Vivian Field Middle School and Newman Smith High School. She also served the Council PTA as Chair of the Gently Used Book Sale and 1st VP of Leadership Development. 

Professional and Personal
Sally is a Registered Nurse and works as the Craniofacial Team Coordinator at Children’s Health in Dallas. She has always had a love and passion for children and knew from a young age that she wanted to be a nurse. In 2018, Sally received the D Magazine Excellence in Nursing Award.  

Sally and her husband, Tony, live in Farmers Branch with their two daughters Emily and Addison, whom both attend CFBISD schools.

Tarah Hrbacek

Tara Hrbacek

Background and Education
Tara Hrbacek grew up in Corpus Christi, TX and moved to Carrollton in 2001. She earned a Bachelor of Science in Construction Engineering Technology from the College of Engineering at Texas Tech University.

Public Service
Tara was elected to the Board of Trustees in May 2017. Before serving on the Board, she was active in the District through multiple roles at local campus PTAs and for the CFB Council PTA.  She has served on Campus Improvement Committees at the elementary and middle school level and has also served as a parent liaison on the District Improvement Council.  Tara was also part of the inaugural class of CFB Ambassadors.

Professional and Personal
Tara is a vice president with a global engineering firm and serves as a director of finance and operations in the US business.  Prior to her finance role, she spent the majority of her career in the aviation industry through positions with general contractors, a major US airline, architectural firm and now an engineering firm.  Through the course of these positions, her focus was on project delivery and operations management, but has transitioned to organizational finance and operations supporting multiple markets such as aviation, transit and rail, maritime, water, energy, and others. Tara is married with one son who is a senior in high school.

Juan Renteria

Juan Renteria

Background and education
Juan Renteria grew up in the Rio Grande Valley and has lived in Dallas for 13 years. He received a bachelor’s degree in Political Science at the University of Texas at San Antonio. In 2004, he obtained his master’s degree in Public Administration from the Maxwell School of Citizenship and Public Affairs, and a law degree from Syracuse College of Law. Mr. Renteria has been a resident in Carrollton-Farmers Branch ISD for over two years and has a daughter currently enrolled in the district.

Public Service
Mr. Renteria was elected to the Board of Trustees for the Carrollton-Farmers Branch ISD in 2020. Mr. Renteria was a founding member of the Mexican American Bar Association (MABA) in 2016. He dedicates his time to volunteer at the Mexican Consulate, where he helps families whose citizen children need legal advice. He mentored and advised law students at the University of North Texas from 2018-2019. Additionally, he dedicates part of his law practice to indigent defense in surrounding counties. Mr. Renteria is passionate about being involved in his community to help and give back to those around him.

Professional and personal
Mr. Renteria has been an Attorney for over 16 years and is licensed in Texas and New York. He has served as a prosecutor, an adjunct professor, a defense attorney, a personal injury attorney, and a municipal court judge.  He founded Renteria Law Firm PLLC in 2010 and provides legal services across Texas. Mr. Renteria was recently admitted to practice before the Supreme Court of the United States, and was recognized as a Top 100 Criminal Defense Lawyers in 2020 and 2021. In his free time, Mr. Renteria enjoys spending time with his family. Mr. Renteria enjoys fly fishing, riding his motorcycle and cooking for his family.