Who is Phoenix Nuclear Labs?

Since its founding in Madison, Wisconsin in 2005, Phoenix Nuclear Labs (PNL) has designed and manufactured the highest-yielding neutron generators available in the World. PNL’s commitment to commercializing nuclear technologies for practical applications has inspired our long-term goal of producing clean, fusion energy. Our achievements have enabled PNL to market our technologies across a variety of applications within medicine, defense, and energy sectors. Please refer to our Case Studies page to see real-world applications of the science behind our products.

PNL’s technology has advanced through several generations of products and designs over the last decade. However, it has only been within the last few years that PNL has evolved from a custom R&D shop into an industry-leading manufacturer of state-of-the-art particle acceleration and neutron generation systems.

At Phoenix Nuclear Labs, we are committed to fortifying an improved future by using nuclear science. It is our mission to provide nuclear technology for the betterment of humanity.

Please contact us for more information about our products and/or services.

Meet our Management Team


Over the course of the past 10 years, PNL has strategically shaped a management team dedicated to advancing our nuclear science into the forefront of the World’s fusion technologies. PNL’s diverse team maintains extensive technical expertise, years of manufacturing experience, and also, success in growing small businesses into industry-leading suppliers. We understand the practical realities of bringing highly specialized and technical products to market and, we know how to build systems that are safe and reliable.

Dr. Ross Radel

Ross is the President and a Board of Directors member of Phoenix Nuclear Labs. He holds a MS and a PhD in Nuclear Engineering from the University of Wisconsin-Madison. He previously worked as the Senior Member of the Technical Staff at Sandia National Laboratories. Ross has extensive experience with nuclear reactors and advanced power conversion systems that are directly applicable to PNL’s core technologies. His previous research at the University of Wisconsin focused on high-flux neutron generation for detecting clandestine material, specifically highly enriched uranium.

Prior to taking over as President, Ross led the R&D effort to redesign the existing PNL ion source and neutron generator technology, leading to drastic performance increases. He is also an expert in radiation transport simulations and he has experience designing shielding, moderators, and reflectors for high-neutron environments. Ross joined PNL in 2010 and took over as President in July of 2011. During his tenure as President, PNL has more than tripled in size. As President, Ross has a very hands-on management style and is still intimately involved in almost all aspects of the daily technical and business operations at PNL.

Dr. Tye Gribb

Tye is the VP of Research and Development at PNL. He has over 20 years of experience developing products for high technology companies. He was the co-founder of Imago Scientific Instruments (now part of Cameca Instruments Corporation), where he led the development of the Local Electrode Atom Probe (LEAP), Imago’s flagship product, from initial sketches through commercialization. From its market introduction, this instrument has dominated the world market with sales in excess of $100M. Tye has wide-ranging design, fabrication, and scientific analysis expertise focused on the development of ion beam and other high-energy systems. He is the author of numerous papers and patents covering a wide range of technical innovations. Tye holds a PhD from the University of Wisconsin-Madison in Metallurgical Engineering. As the VP of R&D, Tye leads a talented team of technicians and engineers in both next-generation product design and, in moving prototype technologies onto commercial platforms.

Dr. Evan Sengbusch

Evan is the VP of Business Development at PNL and holds a BS in Physics and Mathematics from the University of Iowa, as well as an MS and PhD in Medical Physics, and an MBA in Technology Management from the University of Wisconsin-Madison. Evan has extensive experience with computational modeling, ion beam transport simulations, and particle accelerator design. He has also worked in the venture capital industry evaluating technologies in the physical and life sciences and has served as a consultant for several technology development firms. Evan is a past recipient of a DoD National Defense Science and Engineering Graduate Research Fellowship, an NSF Graduate Research Fellowship, and a National Institutes of Health Biotechnology Training Grant. He has technical experience working in accelerator physics at CERN, plasma physics at the University of Iowa and medical physics at the University of Wisconsin – Madison. Since joining PNL in 2012, Evan has increased the variety and size of PNL’s revenue sources and has drastically expanded PNL’s market reach.

Mr. Steve Books

Steve is the VP of Operations at PNL. He is a seasoned executive with extensive experience in General Management and Operations in entrepreneurial manufacturing organizations that required leadership to accelerate from early stage, to the next level of business success. As part of Marquette Medical Systems, Steve was responsible for the P&L of the $200 million Cardiology division, after filling a number of manufacturing and engineering management roles. GE purchased MMS in 1999 and Steve began managing Global Operations and Supply Chain for GE-Marquette. More recently, Steve was responsible for R&D, Service, Manufacturing, and H/R as COO of TomoTherapy, an innovative radiation therapy device manufacturer for cancer treatment.

Mr. Ted Staub, PE

Ted is the Director of Engineering at PNL. He holds a MS in Electrical Engineering from Drexel University and he has 30 years of experience in designing and building reliable high voltage power supplies. He has designed and built air-to-air missile electronics for Raytheon, as well as airborne high voltage power supplies for Texas Instruments and the US Navy. Ted has also designed the power subsystem for two NASA missions to Mars for Lockheed Martin. Ted has been a member of the IEEE for 31 years and is a registered professional engineer.

Board of Directors

Dr. Tsahi Gozani recently retired from Rapiscan Laboratories where he served as President, CTO, and chief scientist. In addition to sitting on the PNL board, he provides technical consultation to PNL scientists and engineers. He earned his DSc in Reactor/Neutron Physics from the Swiss Federal Institute of Technology (ETH). He has developed and implemented active, non-intrusive assay and inspection techniques for nuclear materials and other threats relevant to defense and homeland security. Dr. Gozani has authored more than 250 papers in technical journals and conference proceedings. He is the inventor and/or the co-inventor on eight patents (plus 3 pending) in the area of explosives and nuclear material detection.

Mr. Terry Kelly recently retired as the President and Principal owner of Weather Central, Inc. He currently represents Wisconsin Investment Partners on the PNL board. He is the President of Venture Management, LLC and a member of the Advisory Board of Venture Investors, LLC. Over the course of his career, Mr. Kelly has founded several successful technology companies. He holds The American Meteorological Society’s Seal of Approval and the AMS award for Outstanding Service by a Broadcast Meteorologist. Mr. Kelly received a degree in Meteorology from the University of Wisconsin-Madison.

Dr. Gregory Piefer founded Phoenix Nuclear Labs in 2005 following the completion of his PhD in Nuclear Engineering from the University of Wisconsin-Madison. In addition to serving on the PNL board, he is the CEO of SHINE Medical Technologies, a company that spun out of PNL and is focused on building a medical isotope production facility in the United States that will utilize PNL’s core neutron generator technology. He previously served as Chief Technical Officer to Gillware Inc., a leading data recovery and remote data backup company.

Mr. Larry Weyers is currently the Lead Director of Green Bay Packers, Inc. and previously served as treasurer with them. Mr. Weyers was formerly President and Chief Executive Officer of Integrys Energy Group, Inc. (alternatively, WPS Resources Corp.). He has a wealth of experience in the nuclear and fossil fuel power generation industries and possesses substantial corporate leadership and governance skills. He is a registered professional engineer. Mr. Weyers received a Bachelor of Arts in Mathematics from Doane College. He also holds a MS in Nuclear Engineering from Columbia University and an MBA from Harvard University.

Mr. Donald Whelley is the Managing Member of DJW Advisors. He serves on the PNL Board of Directors as a representative of Knox, LLC. Mr. Whelley has worked for over 30 years in energy and financial services, providing valuation and advisory assistance. Recently, Mr. Whelley has been in charge of supporting clients investing in other industry sectors, including mining and biotech. Since earning a BS in Accounting from Clarkson University, his career experience has included accounting, finance, and acquisition work for companies involved in oil and gas, agricultural biotech, broker, dealer and syndication of real estate investments, and energy consulting.

Scientific Advisors

Dr. Paul M. DeLuca Jr. is Provost and Vice Chancellor of Academic Affairs at the University of Wisconsin-Madison. He was previously the chair of the Medical Physics Department and holds an appointment as Professor in the Departments of Medical Physics, Radiology, Human Oncology, Engineering Physics, and Physics. His research interests have concentrated on fast neutron dosimetry including production of intense sources of fast neutrons, determination of elemental neutron kerma factors, and application of microdosimetry to radiation dosimetry. He is also the chair of the Nonproliferation and International Security Division Review Committee (DRC) at Los Alamos National Laboratory. He earned a BS in physics and math and a PhD in nuclear physics from the University of Notre Dame.

Dr. Thomas “Rock” Mackie currently serves as the Director of Medical Devices for the Morgridge Institute for Research. He was previously a Professor of Medical Physics, Human Oncology, and Engineering Physics at the University of Wisconsin-Madison. Dr. Mackie was the Chairman of the Board of Directors of TomoTherapy, Inc and he was the cofounder of Geometrics Corporation (acquired by Philips) and TomoTherapy (acquired by AccuRay). He has authored more than 130 peer-reviewed publications and is an author on more than 25 patents. Dr. Mackie currently serves on the Boards of BioIonix, Cellectar, ESCAPX, and Compact Particle Acceleration Corporation. He holds a PhD in Physics from the University of Alberta.

Dr. Harrison Schmitt previously served in the US Senate and was the Lunar Module Pilot on the final Apollo 17 mission to the moon. He also served as a Mission Scientist in support of the Apollo 11 mission. He was the only scientist, and the last of twelve men, to step onto the Moon. He continues to work in science, aerospace, and business. Dr. Schmitt chaired the NASA Advisory Council from 2005-2008.