Commercial Services

Mark Johnston serves as Senior Vice President and Chief Lending Officer, managing the day-to-day operations of the Commercial Services Department, to include business development and loan/credit administration. Prior to joining GFCU, Mark served as Vice President, Relationship Manager at Chase and as Vice President of Corporate Lending at TransPecos Banks. He brings 14 years of experience in commercial lending to the credit union. Mark earned his B.B.A. in Finance from Texas State University and is an active member of their Finance and Economics Advisory Board. He also sits on the board of the Green Spaces Alliance of South Texas and is a graduate of Leadership San Antonio Class 46.

Cassian Flores serves as AVP of Commercial Operations for Generations. In this role, he oversees all commercial underwriting and Loan Administration. Cassian joined GFCU in 2019 and previously held the roles of Commercial Operations Manager and Senior Commercial Relationship Manager. Prior to joining GFCU, Cassian served as Commercial Loan Officer at Randolph-Brooks FCU and as Vice President, Relationship Manager at Chase. He brings over 17 years of experience in commercial lending to the credit union. Cassian earned his B.B.A. in Finance from The University of Texas Rio Grande Valley. Additionally, Cassian serves on the San Antonio Better Business Bureau Advisory Committee and is an avid volunteer for the Texas Ramp Project.

Joshua Roberts has served as Generations’ Commercial Loan Administration Manager since August of 2018. In his role with the credit union, Joshua oversees all commercial loan administration tasks, processes, procedures and reporting. He has more than 10 years of banking experience, previously holding roles in loan administration for Lone Star Capital Bank and TransPecos Banks, SSB. Joshua has also worked in consumer lending at Wells Fargo and call center management at Wachovia Bank. He holds an AA in Liberal Arts and General Studies from St. Philip’s College.

Ernest Stephenson joined the credit union in October of 2019 as the Commercial Portfolio Manager. In his role, he is responsible for underwriting commercial loan applications and monitoring the commercial loan portfolio. Ernest was previously a Credit Analyst with Vantage Bank before joining Generations. He holds two BA degrees in Mathematics and Economics from Texas Lutheran University, as well as an MS in Finance from Texas A&M University. Ernest also sits on the board for the San Antonio chapter of RMA Young Professionals.

Sandra Landeros joined Generations in August of 2023 as a Commercial Loan Administration Associate. In her role, she manages all aspects of commercial loan booking, funding, processing and closing. Sandra brings more than 12 years of commercial lending experience to Generations, having previously held positions in commercial loan administration at Frost Bank and Security Service FCU. She enjoys volunteering with several local organizations, including the San Antonio Food Bank, Morgan’s Wonderland, the Special Olympics, Habitat for Humanity and Ronald McDonald House Charities.

Juan Trejo has served as Commercial Credit Analyst for Generations since October of 2019. In this role, he reviews and analyzes commercial borrowers’ credit, to include financial statements, tax returns, historical operating performance and future plans, among other factors. Juan has been with Generations since 2012, serving in a number of consumer and commercial positions both in-branch and in support departments. He holds an AA in Accounting from San Antonio College and will graduate with a BBA in Accounting from the University of the Incarnate Word in December of 2019. Juan is also a regular volunteer with the San Antonio Food Bank.