Tamzen Macbeth is a senior environmental engineer at CDM in Idaho Falls, Idaho. She has worked for CDM since 2009. Previously, she worked for 7 years at North Wind Inc. Tamzen 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 for contaminated groundwater. Specifically, she is experienced in all aspects of remedies for characterization and remediation of contaminated sites including DNAPLs, dissolved organic, inorganic, and radioactive contaminants under CERCLA and RCRA regulatory processes. She has expertise in a variety of remediation techniques, including in situ bioremediation, natural attenuation, in situ chemical oxidation, and thermal treatment. Her current work focuses on application of enhanced ISB and monitored natural attenuation in combination with other aggressive technologies such as in situ chemical oxidation and thermal remediation for effective treatment of groundwater plumes containing residual source areas. Since 2004, Tamzen has contributed to the ITRC as a team member and instructor for the ITRC’s Bioremediation of DNAPLs team. Tamzen earned a bachelor's degree in Microbiology in 2000 and a master’s degree in Environmental Engineering in 2002 both from Idaho State University in Pocatello, Idaho, and a doctoral degree from in Civil and Environmental Engineering in 2008 from the University of Idaho in Moscow, Idaho.