Alex Wesner

Alex Wesner, P.E., is a Fellow Environmental Engineer at Brown and Caldwell, a full-service environmental engineering and construction services firm. As a chemical engineer, he brings more than 30 years of experience in the design of advanced water treatment systems incorporating membrane technologies like ultrafiltration, nanofiltration and reverse osmosis. His work includes preparing piping and instrumentation drawings, technical specifications and process mechanical drawings. He is based in Brown and Caldwell’s San Diego office and previously was co-owner of Separation Processes, Inc. (SPI), which Brown and Caldwell acquired in June 2025.