Senior Advisor Program

A.C. Gonzalez has served communities throughout Texas for more than 37 years. During his career, he served as city manager of the cities of Dallas, San Marcos, Carrizo Springs, and Dilley. A. C. can be contacted at or (469) 688-1661.






bobBob Livingston is the first Senior Advisor and a TCMA Life member. Bob served more than 23 years as the city manager of the City of University Park. He has served as city manager in the cities of Santa Paula, California and Dodge City, Kansas. He also served as and assistant city manager in Highland Park, Illinois and Lompoc, California. Bob can be contacted at or (214) 212-8162.







George Shackelford has served communities throughout Texas since 1979. During his career, he served as city manager of the cities of Littlefield, Port Lavaca, Texarkana, and Tomball. George holds a bachelor’s degree in criminal justice administration and a master’s degree in social science with an emphasis in public administration. Both degrees were completed at West Texas State University. George can be contacted at or (903) 748-5222.





Greg Vick has served communities throughout Texas since 1976. During his career, he served as city manager of the cities of Gladewater, Cedar Hill, Elgin, and Watauga. Greg holds a bachelor’s degree from Abilene Christian University and master’s degree from the University of North Texas. Greg can be contacted at or (214) 477-8413.



About the Senior Advisor Program

The Senior Advisors Program, formerly known as Range Riders, is a partnership  program between TCMA and ICMA to make the counsel, experience, and support of respected, retired managers of the profession available to individual members. The program is designed to help with personal and professional issues, but does not provide any form of technical assistance nor to solve substantive problems in a local government.

  • Senior Advisors are available to meet periodically with members to discuss the profession and concerns of members. Discussion topics range from problems with mayors and councils, overall management questions, relations with ICMA, responses to local controversies such as referenda on the council-manager plan, to career development counseling.
  • All discussions are confidential. Senior Advisors are friends, colleagues, and counselors to the profession—not consultants. The Senior Advisor program is designed to help with personal and professional issues, not to provide technical assistance or solve substantive problems in a local government.  Senior Advisors also help communities interested in adopting or retaining council-manager government. However, Senior Advisors may consult with local governments as individuals, on a part-time basis, as long as the consulting does not impair the effectiveness of the Senior Advisor. Senior Advisor guidelines contain advice for Senior Advisors who do part-time consulting.
  • Senior Advisors are not compensated and the program is designed to expect from the Senior Advisors only the time they feel comfortable donating to the profession—usually a few days per month. Only expenses are reimbursed.
  • Senior Advisors are selected jointly by the ICMA Executive Director and the managers’ state association. Expenses are shared by ICMA and the sponsoring state organization.  The amount of expenses allocated depends on the size of the state, the number of Senior Advisors, and funds available from the sponsors.