Executive Management Team

In addition to the General Manager / CEO, the following staff members comprise GBRA's Executive Management Team.

Darrell Nichols

Darrell Nichols
Sr. Deputy General Manager

The Senior Deputy General Manager is charged with the development and implementation of the Authority's policies, and has general oversight of daily operational and administrative activities. The Senior Deputy General Manager assists with directing GBRA's programs related to project development and construction activities, financing of water infrastructure projects, scientific data collection and dissemination, hydrologic and environmental analysis, water supply planning, and water policy development.

Nichols has been working in the utility industry for 25 years. Prior to joining GBRA, his roles at the Texas Water Development Board (TWDB) included assistant executive administrator and director of Regional Water Planning and Development. In addition to consulting, he also previously performed utility regulatory work at the Texas Commission on Environmental Quality (TCEQ).

Nichols earned his bachelor's degree in civil engineering from the University of Texas at Austin.

Phone: 830-379-5822 Ext. 314
Email:

Jonathan Stinson

Jonathan Stinson
Deputy General Manager

The Deputy General Manager is responsible for the implementation of the GBRA's programs and policies in an efficient and effective manner in conformance with the authority's governance, management, operational structure, and statutory requirements. Stinson also is charged with general oversight, development, and implementation of GBRA's policies, and assists with the daily administrative and operational activities.

Stinson, formerly an assistant executive administrator at TWDB focused on policy considerations related to water infrastructure development and financing, program development and agency administration. Prior to joining TWDB, he served as a natural resources policy advisor to the governor in the Office of Budget, Planning and Policy, where he focused on programs and policies affecting water, parks and wildlife, and agriculture. He also worked in the Texas Senate for nearly 10 years, during five legislative sessions, working on issues ranging from groundwater and surface water policies, infrastructure financing, and economic development issues.

Stinson earned his bachelor's degree from Texas A&M University.

Phone: 830-379-5822 Ext. 507
Email:

Thomas Hill

Thomas Hill, P.E.
Senior Advisor to the General Manager

The Senior Advisor to the General Manager provides advice and guidance to the general management team and executive staff on GBRA programs, operational activities, project development and strategic planning. He reviews GBRA engineering contracts, procurement procedures, and focuses on project development and implementation.

Hill is a registered professional engineer, earned his Bachelor of Science degree in civil engineering from Texas A&M University, and continued his graduate studies at the University of Texas at San Antonio.

Phone: 830-379-5822 Ext. 245
Email:

David Harris

David Harris
Executive Manager of Operations

The Executive Manager of Operations serves as the chief operations officer and directs water resource management, recreation and parks, and utilities operations in all 10 counties of GBRA's statutory district. Harris assists in the negotiation and development of major contracts and represents GBRA with its customers. He also is responsible for ensuring the provision of technical assistance to GBRA's water and wastewater treatment facilities, and advises and consults with personnel of other such facilities within GBRA's district operated by other entities (municipalities, MUD's, private contractors, etc.).

Harris has more than 30 years of experience in the water and wastewater industry, and holds Class A Operator licenses in water treatment, wastewater treatment, municipal solid waste, and customer service inspection. He earned a Bachelor of Science in Wildlife Fisheries Sciences and a Bachelor of Science in Rangeland Ecology and Management from Texas A&M University.

Phone: 830-379-5822 Ext. 277
Email:

Charles M. Hickman

Charles M. Hickman, P.E.
Executive Manager of Engineering

The Executive Manager of Engineering is responsible for the design and construction of GBRA's capital improvement projects, oversees water resource planning projects, and provides operational assistance on technical procedures and issues related to GBRA's existing facilities. Hickman oversees the monitoring of flow conditions within the river basin, interpretation of hydrologic events and data, and development of independent engineering design analyses. He evaluates and expands strategic business alliances for GBRA, oversees activities for new services and projects, property acquisition, and acquisition of state and federal permits.

Hickman is a licensed professional engineer with a background in providing consulting engineering services related to water resources, public works, and private development projects. He earned his Bachelor of Science in Civil Engineering from the University of Texas at San Antonio and his master's degree in Engineering Management from the University of Texas at Austin.

Phone: 830-379-5822 Ext. 240
Email:

Randy Staats

Randy Staats
Executive Manager of Finance/CFO

The Executive Manager of Finance/CFO is responsible for the overall management of GBRA's Finance Department and leads all accounting and finance efforts, including budget and financial plans, payroll, capital assessments, debt services and financial reserves as well as the preparation of the annual financial report.

Staats is a certified public accountant and certified internal auditor with decades of experience as a financial leader. Prior to GBRA, he worked for Round Rock ISD for 20 years and was previously employed in the banking industry.

He has a degree in finance from Texas A&I University and a master's degree in accounting from Southwest Texas State University.

Phone: 830-379-5822 Ext. 482
Email:

Vanessa Guerrero

Vanessa Z. Guerrero
Executive Manager of Administration

The Executive Manager of Administration oversees the Human Resources, Communication, Education, and IT Departments. Guerrero is responsible for strategic planning, recruitment, training development, direction and overall management of the human resources functions while steering GBRA's educational outreach, strategic communications and technical infrastructure.

Prior to joining GBRA, Guerrero served as a human resources leader to San Antonio non-profit organizations including Haven for Hope and The Boys and Girls Club of San Antonio. Her expertise encompasses over 10 years of experience.

Guerrero earned her bachelor's degree in human resources from The University of the Incarnate Word.

Phone: 830-379-5822 Ext. 234
Email:

Nathan Pence

Nathan Pence
Executive Manager of Environmental Science

The Executive Manager of Environmental Science is responsible for the management of GBRA's environmental stewardship programs, while overseeing the Canyon Lake Gorge and the GBRA Laboratory.

Pence has more than 15 years in watershed management and planning with an accomplished record of collaborating with local officials and stakeholders. Prior to GBRA, Pence served as the Threatened and Endangered Species Executive Director for the Edwards Aquifer Authority (EAA) in San Antonio, where he facilitated and managed the Edwards Aquifer Habitat Conservation Plan (EAHCP). Additionally, he's worked for the City of New Braunfels collaborating with local tourism officials and environmentalists to improve economic development opportunities, while protecting the integrity of the natural resources.

Pence earned his bachelor's and master's degrees in Aquatic Biology from Texas State University.

Phone: 830-379-5822 Ext. 239
Email:

© 1998 Guadalupe-Blanco River Authority