Tamzen Macbeth is an environmental engineer with an interdisciplinary academic and research background in microbiology and engineering. She specializes in the development, demonstration, and application of innovative, cost-effective remedial technologies. Macbeth has been involved in a variety of innovative technology evaluations through the Department of Defense SERDP/ESTCP program and ITRC. She has written numerous technical reports, peer-reviewed articles, and been an invited speaker at international conferences and symposia on innovative remedial technology application for cost-effective remediation.