ReNuke is a Veteran Owned Small Business (VOSB) that has been supporting the nuclear fuel cycle industry with high-quality staffing services and turnkey project execution since 2006.  During this time we have developed a reputation for both exceptional customer and employee service while consistently delivering safe, on-time performance.

Our focus is on providing the highest quality management and technical talent for nuclear construction, licensing, operations, remediation, and decommissioning, decontamination, and demolition.  This narrow focus on nuclear give ReNuke a broad and deep understanding of the unique skills necessary to successfully staff complex nuclear projects, from a highly developed safety culture to rigorous training and procedural compliance requirements, analysis and mitigation of risks, quality assurance processes, management self-assessment, and nuclear safety requirements.

The nuclear experience of our leadership team and technical staff spans a collective 200 years and management of over 150 nuclear projects.  Doing it is one thing,  Doing it right and to our client’s satisfaction is Our Thing.

Fast, flexible and with the top professionals in the business, see what a difference ReNuke can make for your project. Call today at (865) 813-1960 or email us for more information.

ReNuke Staff


Ian Howard – President

Ian grew up in southeastern Michigan and graduated from the University of Maryland with a BS in Business Management and Finance, and studied Environmental Law at the University of Maryland Law School.  Ian’s nuclear experience experience spans 42 years, beginning with spending 6 years in the U.S. Naval Nuclear Propulsion program.  His experience includes technical, project management and executive experience with utilities, architect-engineering firms, staffing firms, and waste management firms, including Kellogg, Brown & Root, Consumers Power Company, and Duratek.  Ian has led organizations as large as 500 employees with $90 million in sales and has managed a diverse portfolio of more than 60 projects over his career supporting DOE, DOD, Army Corps of Engineers, and commercial and naval nuclear facilities. He has personally managed multiple complicated contract labor transitions during his career.

Ian joined DeNuke Services in May 2006 to develop its commercial nuclear division, now ReNuke Services, a separate, stand-alone corporation. On December 31, 2012, DeNuke spun off ReNuke as an independent company and Ian purchased half of the business. He is currently responsible for general management of the business including all corporate business functions, contracts, and accounting.

Mark Kirshe

Mark Kirshe – Senior Vice President and Chief Marketing Officer

In July 2014, Mark joined ReNuke as an owner and Chief Marketing Officer. His long and substantial career includes developing not only clients but technical solutions to those clients’ challenges. Mark holds both BS and MS  degrees  in business and marketing and is a co-patent holder on a first-of-a-kind radioactive waste water treatment process. He has held business operations, business development, and executive level positions with Chem-Nuclear Systems, Duratek, Inc., Energy Solutions, and Environmental Chemical Corporation (ECC). Mark and Ian first worked together twenty years ago on a joint venture project between Chem-Nuclear Systems and Duratek, Inc. to treat spent power plant resin.

Marcie Acosta – Vice President of Finance & Administration

Marcie was born and raised in East Tennessee to a family of small business owners. Growing up she watched her mother keep the books and run the payroll for their electrical business. At an early age, she developed her interest in Accounting and by age 10 was helping her mother make entries on the balance sheet. She started at the parent company of ReNuke  in 2010, where she received two promotions in just two years. While working full time, Marcie also attended night classes at Tennessee Wesleyan College and in the spring of 2013, graduated with a Bachelor of Science degree with concentrations in Human Resource Management & Accounting. After graduation, Marcie was promoted to Staff Accountant at ReNuke and has since been promoted and is serving as Vice President.

Wendy Lambert

Wendy Lambert – Vice President, Business Development & Communications

Wendy graduated from Northern Illinois University with a BS in Business Administration, Marketing Concentration. During her 25 year career in marketing and communications she has had a diverse work history including working in television, non-profit, and the nuclear industry.  Prior to joining ReNuke, Wendy was the Business Development and Marketing Manager for Enercon Federal Services, where she also served as the Public Outreach Manager for the DOE-NE Deep Borehole Field Test project.  In this role she was responsible for the communication plan, stakeholder engagement, public meetings, and press relations in and around the projected field test site.  Prior to that she was the Marketing Director and Waste Services Proposal Manager for Perma-Fix Environmental Services.  She has extensive experience with developing winning proposals, writing press releases and media relations, developing communications plans, and branding.  Wendy is a member of the Public Relations Society of America, including the Public Affairs section, and served on the Programs Committee for the Tampa Bay chapter before moving back to Tennessee.

John Coffman – Senior Consultant/Board of Directors

John was raised in New Mexico and graduated from Colorado State University in 1976 with an MS in Health Physics and was certified by the American Board of Health Physics in 1980. John met Ian Howard during the acquisition of Waste Management Federal Services by Duratek in 2000. They both served on the senior management team of the combined entity post-closing.

John managed health physics operations at Rocky Flats, trained first responders at the Nevada Test Site, and supervised over 350 health physicists during the 18 year cleanup of 13 uranium mill tailings sites – the UMTRA Project. John has managed first of a kind projects including the Melton Valley TRU Project, response to hurricanes Katrina, Rita, and Wilma, and the 3 Building D&D Project in Oak Ridge.

Phil Gianutsos, CHP – Radiation Safety Officer

Mr. Gianutsos is a health physicist, with current certification by the American Academy of Health Physics and experience in a variety of settings, focusing primarily on radioactive materials management. Experience as a Radiation Safety Officer has included work with Agreement State and Federal regulators concerning radioactive materials licensing and characterization work. This included providing technical reviews and development of licensee comments concerning proposed rules and revisions to NRC Branch Technical Positions.  Other roles included radioactive waste and materials import/export licensing and health physics consulting to power and research reactor programs, university licensed programs, fuel fabrication and industrial licensed programs.

Jerry Bergeron – Transportation Manager

Jerry has more than 38 years of commercial and government nuclear industry experience and is a certified Advanced Waste Shipper. Over the course of his military, commercial, and DOE tenure, he has made over 500 LLRW and SNM shipments, including spent fuel from a commercial nuclear power plant. Jerry joined ReNuke in 2012 to lead a legacy waste packaging and shipping campaign for GE-Hitachi at their Wilmington and Vallecitos locations. He subsequently assumed the role of Radiological and Safety Supervisor for the overall decontamination and dismantlement contract with GE-Hitachi.

Jerry is currently part of the project team readying the defueling and move of a university research reactor from one campus location to another. His career began in the Navy Nuclear Propulsion Program where he was a qualified reactor operator and engineering laboratory technician. One of Jerry’s passions is umpiring amateur softball throughout the southeastern U.S.

Sharon Fennell – Staffing Manager

Sharon grew up in northern Virginia. Joining ReNuke in July of 2009, Sharon is a seasoned recruiter in the nuclear power industry however her recruiting background includes over 25 years building a proven track record in fossil, aircraft / aerospace, pharmaceutical, chemical / petrochemical sectors as well. Sharon has leadership responsibilities for all staffing operations. For over seven years Sharon was an active manager and recruiter, owning her own staffing company which provided invaluable experience not only on the recruiting side but in marketing, business development,

advertising, and policy and procedure development. As a principal in this company Sharon was also responsible as the Facility Security Officer for both DOE and DOD contracts involving the clearance process and maintenance of both employee and facility clearances. Prior to this, Sharon was the on-site manager for a staffing firm providing engineering support to a commercial nuclear facility in the southeast while also supporting engineering needs at other commercial power plants. Early in her recruiting career, Sharon was involved in staffing outages for nuclear power plants in Florida as well as engineering positions for Government contractor firms in support of NASA programs. .She is widely known and highly respected in the industry by both candidates and customers.

Kristi Pollard, PHR – Human Resources Manager

Kristi was born in Knoxville and is a graduate of The University of Tennessee, Knoxville.  She obtained her Professional in Human Resources Certificate (PHR) in June 2012 and has over 22 years of experience in HR.  Kristi joined ReNuke in April, 2013 and is responsible for all benefit programs and diverse duties involved in Human Resources. Prior to that, she played a vital role in the start-up and success of a small staffing company as Director of Human Resources.  Kristi’s background includes working with federal and commercial contractors providing personnel to various government agencies nationwide.  The focus of her experience involves onboarding new hires in a fast-paced environment to include workers’ compensation, benefits & 401k administration for employees nationwide.