Tai-Dan Hsu, PhD, PE – CEO and Co-Owner

Dr. Tai-Dan Hsu is a co-founder and co-owner of PWT since it was incorporated in 1987. Dr. Hsu has more than 30 years of experience in water resources, environmental compliance, engineering design and cost analysis.

Ding-Wen Hsu, EMBA – Division Manager and Co-Owner


Ding-Wen Hsu is co-founder and majority shareholder of PWT. Ms. Hsu has more than 30 years of MIS and managerial experience. As PWT’s President, she directs overall business operations including strategic development, long-term planning, and financial management. A native of Taiwan, she has been very active in the Asian American communities in Denver since she moved to Colorado in 1978. She is one of the founders of Colorado Dragon Boat Festival, the largest Asian American festival in the Rocky Mountain region. 

Michael Hoxie, PMP – Vice President of Business Growth

Mike is responsible for identifying and developing business opportunities for PWT.  He brings over 30 years of federal experience managing projects and programs both domestically and internationally for the USACE, US Navy, EPA and DOE.  He is also a retired US Army officer with 28 years of service and two combat deployments.  Mike resides in Helena MT where he is active in the community supporting youth soccer programs.

Ram Ramaswami, PhD, PE – Division Director of Environmental and Engineering Services

Dr. Ram Ramaswami is PWT’s Environmental and Engineering Services Division Director with more than 35 years of experience as a senior program manager and senior environmental/chemical engineer. Dr. Ramaswami is responsible for PWT’s Remedial Action Contract (RAC) and Rocky Mountain Arsenal Oversight Contract (RMAOS).

Galen Williams, PG – Project Manager, EarthFax Engineering Group, Utah

Engineering Geologist. BS, 1976, Geomorphology, University of Utah. MS, 1981, Applied Geomorphology, University of Utah. Expertise in engineering geology, groundwater-quality and hydrogeologic assessments, remedial-action design and implementation, computer applications, and supervision of field operations. Professional Geologist (Utah, Wyoming).

Billy Lee – Controller

Mr. Billy Lee is responsible for the overall financial and accounting aspects of PWT. He has over 32 years of experience in Finance and Accounting. He is fully competent in all aspects of financial accounting, business administration, budgeting, cost control, payroll, accounts payable, client and audit liaison.



Stephen Singer, PG, PMP – Program Manager

Program manager for EPA’s Unified Remediation Oversite and Rocky Mountain Arsenal Oversite Contracts and is project manager for multiple projects under the EPA Remedial Action Contract for Region 8. Mr. Singer is a PMI certified project manager and has over 30 years of experience in superfund projects in Colorado, Montana and Utah. Primary areas of expertise include Remedial Investigations, RI/FS and RD/RA oversight, geology/hydrogeology, database management and GIS as applied to sites with volatile organic, pesticide, heavy metal and radionuclide contamination.

Timothy Murphy, PE – Director of Project Development

Bruce Peterman, PE, PG, PMP, MCSE, Project Manager, Senior Engineer, IT Manager

Bruce is a senior engineer and project manager with more than 30 years of experience with investigations and remediation project in hydrogeology, geology, engineering, geotechnical, construction management, project planning, groundwater, and mining related mitigation. Expertise in Information Technology (IT) systems and geographical information systems. Maintain corporate IT assets, network infrastructure, operations, technical upgrades, and outside vendors for PWT.