Board of Directors

Who We Are


Board of Directors

Colorado River Land Trust is governed by a board of directors comprised of volunteers from varying professional backgrounds. We take pride in our mission to protect land in Texas and bring a high level of integrity to our fiduciary responsibility of stewarding the resources entrusted to us by the public.

Timothy Timmerman
Timothy Timmerman

Board President

Timothy Timmerman of Austin is a real estate investor and developer and owns Commerce Texas Properties, Inc. He developed the Star Ranch Community and Golf Course north of Austin, is a certified public accountant, and holds a Texas real estate broker’s license. Mr. Timmerman serves on the boards of International Bank of Commerce – Austin, the Round Rock Community Foundation, and St. David’s Medical Center in Round Rock. He is a member of Good Shepherd Episcopal Church of Austin. Mr. Timmerman received a bachelor’s degree from Texas A&M University and a master’s degree from The University of Texas at Austin.

Ray Wilkerson

Ray Wilkerson

Vice President

Ray Wilkerson is the president and CEO of Ray Wilkerson Companies, Inc., a real estate investment firm. He serves as the Central Texas Regional Mobility Commission chairman, is a board member of Colorado River Foundation Tributary League Endowment, and is a founder and board member of the HeartGift Foundation. Mr. Wilkerson is also vice-chancellor of Knights of the Symphony and a life member of the Austin Travis County Livestock Show. Mr. Wilkerson is the former chairman of the Lower Colorado River Authority and served as vice-chair of the Texas Rehabilitation Commission. He received a bachelor’s degree from The University of Texas at Austin.

Thomas Martine
Tom Martine

Secretary/Treasurer

Tom Martine is president of Martine Properties, Inc., and serves as the secretary on the board of directors for the Lower Colorado River Authority. He is also a member of the Austin Commercial Real Estate Society, Real Estate Council of Austin, Austin Apartment Association and Westcave Preserve Committee, Texas Wildlife Association, Austin Woods and Waters, and the Tributary League of the Colorado River Foundation. Mr. Martine received his bachelor’s degree from The University of Texas at Austin. He also serves on the Boy Scouts and Seton League House Board of Directors.

Billy Brown
Billy Brown

A thirty-six-year veteran businessman in the oil and gas service industry, Billy Brown founded three separate national and international companies over his career that ultimately defined the standard in both drilling and completion services. Big Easy Ranch, Mr. Brown’s latest venture, is a member-based ranch that spans 2,000 rolling acres in the Texas foothills of Colorado County, 90 miles west of Houston. Since its debut in 2016, Big Easy Ranch has grown to over 330 members and has become widely recognized for its world-class upland, whitetail deer and exotic hunting, state-of-the-art sporting clay course and trophy bass fishing. The ranch also boasts a nine-hole par 3 golf course designed by Chet Williams and The Golf Academy, overnight accommodations, first-class dining, and an award-winning wine program.

Meredith Cullen
Meredith Cullen

Meredith Cullen is the founder and CEO of Cullen Realty Group and part of the H. R. Cullen family, whose members have lived in the Houston community for more than 100 years. He is vice president and a board member for RHC Operating Company and also serves on the boards of The Cullen Foundation, Pro-Vision Inc., the Baylor Medical Foundation Board and the Houston Area Parkinson’s Society. Mr. Cullen is a former advisory board member for the Legacy Trust Company. He proudly served in the Marine Corps Reserves, and he continues to support veterans’ causes.

Jack Johnson
Jack Johnson

Jack Johnson is president of the David and Eula Wintermann Foundation, located in Eagle Lake. He is a former member of the board of directors of Team Inc., an international services company listed on the New York Stock Exchange, a former chairman of the board of the Lower Colorado River Authority, a former chairman of the board of North Houston Bank and former director of Houston National Bank. He also served as chairman of The University of Texas at Austin School of Nursing Development Board, director of the YMCA of Houston, and director of the University Club of Houston. Mr. Johnson is a lifetime member of the Houston Livestock Show.

Aden Lasseter
Aden Lasseter

As a rancher and land steward, Mr. Lasseter currently resides in Blanco County raising Beefmaster cows and exotic game. He is the founder and former CEO of Austin Capital Mortgage, which he founded in 1995. Mr. Lasseter currently serves as a board member for Georgetown Corporation and is an Advisory Board member for both Texas Regional Bank and Smarter Sorting. He is a former board member for Lonestar Legacy and graduated from Baylor University in 1992 with a bachelor of science in finance.

Carlotta McLean
Carlotta McLean

As a fifth-generation Austinite, Carlotta McLean is a co-founder and partner of Riley-McLean Land. Her background spans a range of land transactions, including residential, commercial, ranch, and investment properties. Ms. McLean received a bachelor’s degree from The University of Texas at Austin and is very active in the community. She serves as a member of the Austin Board of Realtors, the Real Estate Council of Austin, Texas Alliance of Land Brokers, and as the chair of the board for Robinson Family Management. She is also a board member of Austin Commercial Real Estate Society and a past board member and capital campaign chair of Hill Country Conservancy.

Martha Leigh M. Whitten
Martha Leigh M. Whitten

Martha Leigh brings over 39 years of experience in finance, accounting, and real estate, to the Colorado River Land Trust board of directors. As a native Texan, Ms. Whitten owns and operates Alamo Pecan & Coffee Company, Mossy Oak Properties of Texas-San Saba Division, and Whitten ranching operations. She is a former San Saba City Councilwoman and currently serves on the board of directors for the Lower Colorado River Authority, Angel Tree Project for Needy Children, and San Saba’s First Baptist Church.