Our staff is what makes DEI a leading provider of nuclear engineering services. Below are a few of these people.

  • Robert Varrin

    Expertise in chemistry, corrosion, fluid mechanics, and mechanical design

    32 years of experience in nuclear power

    Authored over 200 reports and holds over 15 patents

    Magna cum laude Princeton University

    Robert Varrin, Ph.D.

    Robert Varrin joined DEI in 1993 and is currently a principal engineer and principal officer. Prior to joining us, Dr. Varrin was a senior engineer and program manager at Foster-Miller, Inc. in Waltham, MA; a research associate at the Institute of Energy Conversion in Newark, DE; and an engineer at MPR Associates in Washington, D.C. Dr. Varrin has 32 years of experience in the nuclear power, semiconductor and chemical-process industries. He has authored more than 100 reports and publications and has been an inventor or co-inventor on fifteen U.S. patents in addition to numerous foreign patents. Dr. Varrin's interests and expertise include chemistry, corrosion, chemical cleaning, mechanical design, ultrasonic cleaning, thermodynamics and fluid mechanics. A magna cum laude graduate of Princeton University in 1980, he earned his Masters of Engineering at Stanford University in 1981 and completed his doctoral work at the University of Delaware in 1991.

  • David Gross

    BS/MS in Mechanical Engineering from MIT

    Expert in ASME Codes, Finite Element Analysis, and Mechanical Design

    Over 25 years of experience in nuclear power industry

    Author of over 100 reports and published papers and several patents

    David Gross, P.E.

    David J. Gross has a B.S. and an M.S. in Mechanical Engineering from the Massachusetts Institute of Technology. He has over 20 years of experience in the design and analysis of systems, structures, and components, primarily for the commercial nuclear power industry. Mr. Gross specializes in projects involving finite element analysis and design of specialized equipment for the nuclear industry.

    Mr. Gross joined Dominion Engineering, Inc. in 1989, where he is currently a Principal Officer. He is a member of ASME and a Registered Professional Engineer in the Commonwealth of Virginia.

  • Glenn White

    BS/MS in Mechanical Engineering from University of Maryland at College Park

    Expertise in modeling of materials degradation issues and thermal performance degradation

    Over 20 years of experience in nuclear power industry

    Licensed Professional Engineer in Commonwealth of Virginia

    Glenn White, P.E.

    Glenn White joined DEI in 1993 after receiving BS and MS degrees in mechanical engineering from the University of Maryland at College Park. He is a registered professional engineer in the Commonwealth of Virginia. Currently a principal engineer and principal officer at the company, Mr. White manages consulting and analysis projects primarily for the nuclear power industry and often related to aging degradation of materials, boric acid corrosion, or thermal performance. Mr. White's projects to evaluate materials degradation include nuclear safety and economic risk assessments and apply analytical tools such as probabilistic Monte Carlo simulation, net present value analysis, Weibull statistical modeling, and stress and fracture analyses. In the area of thermal performance degradation of nuclear steam generators, Mr. White investigates the sources of steam pressure loss, the fouling deposition process, and the effects of tube deposits on boiling heat transfer and corrosion.

  • Marc Kreider

    Technical areas: heat-transfer fouling/deposition, engineering economics, and equipment design/testing

    Developed method for evaluating nuclear steam generator thermal performance

    Engineering mechanics degrees from Virginia Tech; 20+ years' experience in nuclear power industry

    Marc Kreider, P.E.

    With a master's in engineering mechanics from Virginia Tech, Marc Kreider joined DEI in 1992. He has worked in a number of different technical areas, including mechanical design and testing, finite element stress analysis, heat-exchanger thermal performance, and investigation of fouling and deposition processes. Since the mid-1990s, he has been the lead engineer in developing, applying, and refining a widely used methodology for quantitatively evaluating the thermal performance and economics of nuclear steam generator operation and management. His recent enhancements to the method have incorporated an integrated statistical approach, including probabilistic simulation. In recent years, Marc has also directed the development, laboratory testing, and field application of custom ultrasonic systems for cleaning deposits from the liquid film evaporator used for waste processing at an Asian nuclear station.

  • John Broussard

    Magna cum laude Virginia Tech

    Extensive expertise in finite element analysis techniques

    Manages computing and telecommunications at DEI

    Licensed Professional Engineer in Commonwealth of Virginia

    John Broussard, P.E.

    John Broussard joined DEI in 1994 after graduating magna cum laude in Mechanical Engineering from Virginia Tech. Mr. Broussard is a registered Professional Engineer in the Commonwealth of Virginia and has experience in the nuclear and fossil power industries. His expertise is in the investigation and technical evaluation of industrial systems and components, often using finite element analysis. Frequently, his work involves application of finite element analysis techniques to materials degradation evaluations. He has authored over 50 reports and publications and is a co-inventor on one U.S. patent. In addition to his technical work, Mr. Broussard manages the computing and telecommunications infrastructure at DEI.

  • Mark Fleming

    BS/MS in Mechanical Engineering from Virginia Tech

    Quality Assurance manager with over 15 years of involvement with nuclear QA

    25 years in the nuclear industry, experience in FEA, steam generator and reactor vessel degradation

    Licensed Professional Engineer in Commonwealth of Virginia

    Mark Fleming, P.E.

    Mr. Fleming is the Quality Assurance Manager at DEI and, as such, manages DEI's nuclear safety-related and laboratory quality assurance programs. In addition, Mr. Fleming develops specialized quality programs/plans to meet unique customer requirements. Since joining DEI in the fall of 1990, Mark Fleming has worked in areas which include finite element analysis, industry support on corrosion issues (e.g., Alloy 600 PWSCC and reactor vessel head wastage), database design consulting, evaluation of SG visual and NDE data, plant-outage support, and laboratory research in vibrations and acoustics. Prior to joining DEI, Mr. Fleming completed his B.S. and M.S. degrees in Mechanical Engineering at Virginia Tech in 1988 and 1990, respectively. His graduate research focused on experimental verification of closed-form solutions for structural responses to piezo-induced harmonic excitation. Mr. Fleming's graduate work and an extension of it were awarded the 1994 Adaptive Structures and Material Systems Best Paper Award by the American Society of Mechanical Engineers. He also worked in the area of manufacturing process/design improvement as an undergraduate intern in the Emissions Control Products group at General Motors. Mr. Fleming is a registered Professional Engineer in the Commonwealth of Virginia.

  • Chuck Marks

    Ph.D. in Chemical Engineering, joined DEI in 1998.

    Expertise in PWR water chemistry (primary, secondary, and auxiliary).

    Expertise in sourceterm and radiation field mitigation.

    Licensed Professional Engineer in Commonwealth of Virginia.

    Chuck Marks, Ph.D., P.E.

    Dr. Chuck Marks' areas of expertise include fluid mechanics, electrochemistry, biotechnology, corrosion, and radiation field control. Dr. Marks works primarily with corrosion issues arising from chemistry environments that develop at nuclear power plants. His publications include peer-reviewed journal articles and industry technical publications on topics ranging from multiphase fluid flow to fundamental corrosion testing to expert systems.

    Dr. Marks joined DEI in 1998 after earning his doctorate in Chemical Engineering from the University of Maryland, College Park. Mr Marks's alma mater is Tufts University, where he earned a B.S. in Chemical Engineering and English Literature. Before joining DEI, Dr. Marks held positions in the plastics and pharmaceutical industries.

  • Ryan Jones

    PhD in Mechanical Engineering from MIT

    Valedictorian of College of Engineering, University of South Carolina

    Expertise in thermal-fluids, acoustics, waves, instrumentation, and control systems

    Joined DEI in 2004

    Ryan Jones, Ph.D.

    Dr. Jones's areas of expertise include thermal-fluid sciences, acoustics, wave propagation, instrumentation and control, and thermodynamics. While working at DEI, Dr. Jones has worked on projects ranging from experimental ultrasonic energy cleaning (UEC) systems to probabilistic Monte Carlo simulations. His publications include numerous journal articles, technical reports and industry publications on topics ranging from two-phase thermal-hydraulics to flow-accelerated corrosion.

    Ryan Jones joined DEI in 2004 after receiving his doctorate in Mechanical Engineering from the Massachusetts Institute of Technology (MIT). Dr. Jones previously received an M.S. from MIT and was employed by the Central Intelligence Agency (CIA); his alma mater is the University of South Carolina, where he graduated as the valedictorian from the College of Engineering with a B.S. in Mechanical Engineering in 1997.

  • Mike Little

    Listed inventor for numerous patents involving specialized equipment and processes

    Expertise in complex experimental testing programs and facility design

    Cornell, Chemical Engineering (2001 COE Valedictorian)

    Licensed Professional Engineer in Commonwealth of Virginia

    Mike Little, P.E.

    Mr. Little is a Senior Engineer at DEI. Over the last 15 years, he has led a variety of technical programs in the areas of corrosion and materials degradation, management of aging components, nuclear power plant chemistry, radiation field management, design and regulatory support for advanced reactors, environmental protection, and decommissioning and waste management. Many of these projects have involved the design of complex experimental test facilities and significant time spent at nuclear installations and other industrial client facilities.

    His current focus is the development of specialized equipment, processes and technology for nuclear facilities and other technical services clients. He is the primary author of more than 200 technical reports and publications for commercial and government clients, and is a listed inventor for 18 patents. He holds a B.S. in Chemical Engineering from Cornell University and was the valedictorian of the College of Engineering in 2001. He is a licensed Professional Engineer in the Commonwealth of Virginia.

  • David Arguelles

    B.S. in Mechanical Engineering from MIT

    Lead engineer for DEI's fuel cleaning development

    Expertise in advanced ultrasonics, stress analysis, and FEA

    Manager of DEI's machine shop

    David Arguelles

    Mr. David Arguelles has focused primarily on the development of equipment for the cleaning of plant systems using advanced ultrasonics. His activities on these projects include laboratory qualification test design and execution, detailed design of field equipment, logistical coordination during fabrication, and training. In addition to his work on ultrasonic cleaning, Mr. Arguelles has worked on finite element stress analyses and is responsible for maintaining the machine tools in the DEI lab facility.

    David Arguelles joined DEI in 2001. Mr. Arguelles graduated with a B.S. in Mechanical Engineering from the Massachusetts Institute of Technology. While at MIT, he placed highly in several undergraduate design contests, most notably the sophomore '2.70' robotics competition during which he received first place honors.

  • Aaron Pellman

    DEI's laboratory manager

    Expert in fabrication techniques, chemical testing programs, and instrumentation

    B.S. in chemistry from Duke University

    M.S. in biochemistry from Johns Hopkins

    Aaron Pellman

    Aaron Pellman is DEI's laboratory manager. He has supported most of the different types of research and testing work which DEI undertakes. These include chemical process qualification testing (e.g., steam generator chemical cleaning and advanced scale conditioning agent applications), deposit/scale characterization activities, development of synthetic deposits to support various types of testing programs, support of fuel cleaning qualification activities, as well as various customized research/testing projects. His support has included both development and implementation of various processes associated with the aforementioned areas of work. In addition to his work in the DEI laboratory, Mr. Pellman has provided on-site support for secondary side steam generator cleaning campaigns both in the U.S. and abroad. Mr. Pellman joined DEI in the summer of 1998 after completing his Master's degree in biochemistry at the Johns Hopkins University. He obtained his B.S. in chemistry at Duke University in 1993.

  • Jean Collin

    B. Eng. in Mechanical Engineering from McGill University

    M.S. in Mechanical Engineering from MIT

    Technical areas: Ultrasonics, mechanical cleaning, equipment design / testing, material testing and characterization, stress analysis, FEA

    Jean Collin

    Mr. Jean Collin joined Dominion Engineering, Inc. in 2004, where he is currently a Senior Engineer. He earned his Bachelor of Engineering at McGill University in 2002 and his Master of Science in Mechanical Engineering at the Massachusetts Institute of Technology in 2004.

    Mr. Collin’s primary areas of focus at DEI have included finite element stress analysis, probabilistic modeling, design and analysis of specialized equipment, corrosion testing, and material characterization. Recently, Mr. Collin led a corrosion and metallurgical test program supporting the qualification of Incoloy 800 sleeves as a repair technique for steam generator tube cracking in France. He has participated in multiple field support campaigns including secondary side steam generator cleanings in France as well as application of a custom ultrasonic cleaning system that he helped design for use at a Japanese utility. He is a member of ASME, is a listed author on more than 50 technical reports, publications, and conference papers, and is a listed inventor on two patents with others pending.

  • George Young

    Ph.D. in Materials Science from the University of Virginia

    Expert in Metallurgy, Welding, Environmentally Assisted Cracking, Alloy Selection, and Failure Analysis

    Over 20 years experience with both light water and advanced reactor systems. Author of over 50 peer reviewed articles and book chapters

    George Young, Ph.D.

    Dr. George A. Young has a B.S. in Materials Engineering from Rensselaer Polytechnic Institute and M.S. and Ph.D. degrees in Materials Science from the University of Virginia. He has over 20 years experience in the nuclear power industry and is expert at identifying, testing, modelling, and resolving issues in both conventional and advanced power systems. Dr. Young is a Faculty Research Associate at Oregon State University and an Adjunct Professor at Clarkson University where he teaches courses in Welding Metallurgy, Fracture Mechanics & Embrittlement of Solids and Diffusion in Solids. Additionally, he worked as a Metallurgist at Benet Weapons Laboratory. Dr. Young has broad expertise in metallurgy, welding, materials processing, environmentally assisted cracking, materials selection, and failure analysis. He is the Author of over 50 peer reviewed publications and has published book chapters on hydrogen embrittlement of aluminum alloys, welding metallurgy, and low temperature cracking of nickel based alloys. Dr. Young joined Dominion Engineering, Inc. in 2017, where he is a Principal Engineer. He is a Member of ASM International, the American Welding Society, and TMS.