About Us


See our Contact page for the best ways to reach us via email, web and phone.

EHT was founded in 2006 and continues to grow rapidly at our new location in North Downtown Seattle. Our core philosophy of delivering innovative, high quality results that exceed our customer/grantor expectations has helped us thrive even in times of economic uncertainty. As we turn a new page in our history by offering commercial products to research and industry, we’d like to thank all those that have helped keep EHT growing. Each day we’re living the “dream job” that we sought to create, accompanied by the best people in the world to make it all happen. Thank You!

Tim Ziemba (founder) & John Carscadden (co-founder)


EHT has had research and development contracts with the Department of Energy, the National Aeronautics and Space AdministrationUnited States Air Force and the United States Navy and has been selected for many Small Business Innovation Research (SBIR) and Technology Transfer (STTR) Awards.  Additionally, EHT has worked with several academic institutions and private laboratories to provide solutions in pulsed power, nanosecond pulsers, diagnostics, and experimental design.


Washington NASA Space Grant

EHT is a very active supporter of student internships via the Washington NASA Space Grant Consortium and self-funded internships. Below are a few examples of some exciting student-driven research occurring at EHT: