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About Us

About Us

VTG, LLC's core competency is Cleanroom Performance Testing for our advanced manufacturing and GMP customers. VTG specializes in critical environment certification testing, decontamination, cleaning, and consulting worldwide. Having over 23+ years of experience in servicing cleanrooms. We provide onsite field services for clean construction, protocol management and training.

VTG, LLC of New England’s mission is to provide the highest quality services, troubleshooting, and remediation for the client industries. When quality matters, VTG is your vendor of choice. VTG provides objective analysis. VTG is result-oriented and has depth-of-service to address any of your cleanroom issues in a professional and competent fashion.

Vision, Mission & Values

Vision, Mission & Values


We strive to make a difference in our global community by providing products and solutions that impact humankind and our planet in a positive way.    


To work with smart and hard-working people to provide expert-level, reliable testing, characterization, validation, and certification services of indoor critical environments, structures, and materials.    


Integrity: Honesty in purpose and intent Accountability: Candid ownership of our personal and corporate activities Reliability: Trust and confidence in our interactions and service products Respect: Acknowledgement of another’s intrinsic worth Kindness: Charitable behavior to all Fairness: Equity and opportunity for all.



Email: [email protected]

Tiffany A. Russell has more than 23 years of international industry experience in cleanroom performance and indoor critical environment testing.


VP of Business Development

Email: [email protected]

Mindi J. Young has more than 21 years of industry experience in cleanroom performance and indoor critical environment testing. Mindi is a NEBB Cleanroom Performance Testing Certified Professional.



Matthew C. Lemieux has over 43 continuous years of field experience as a biological safety cabinet certifier, air, and water balancer & cleanroom certifier and design engineer.

Mr. Lemieux has a B.S. in mechanical engineering from Northeastern University, a Massachusetts E.I.T. registration, an associate degree in electronics engineering from ITT Technical Institute, a former Massachusetts HVAC license, Eagleson Institute honor member recognition, and has been an ANSI/NSF-49 accredited biological safety cabinet certifier since 1997. He is a NEBB CPT-CP Certified Professional as well as a CETA accredited RCCP-SCF for sterile compounding facilities, ASHRAE-110 fume hoods and cleanrooms. He is a NEBB CPT committee member and regular contributor to the NEBB Professional publication and CETA Performance Review.

Mr. Lemieux’s broad expertise involves ANSI/NSF-49, N.E.B.B., I.E.S.T., ISO 14644, USP, ASHRAE and many other industry standards and documentation. Mr. Lemieux is the most sought-after controlled environment instructor in the United States and Asia. His proprietary and unique instructional approaches, methods, and materials have proven uniquely  successful with aspirational candidates of all backgrounds and experience.



Kellie has over 30 years of experience in cleanroom field operations as a service manager for the biotechnology, pharmaceutical, sterile compounding, defense, and semiconductor industries. Her core competencies extend from scheduling, dispatching, client support, customer relations, troubleshooting, reporting, and quality assurance. She has managed detailed operations for as many as 12 full-time service personnel with multi-million dollar revenue.

Matt Stewart

Matthew Stewart

Matthew Stewart, Project Manager, and Quality Representative, is a New Hampshire native who started with VTG in 2023. With 9 years of prior experience in the field, Matt obtained his NEBB CPT CT Certification in 2019 and has been NSF 49 accredited since 2016. Matt believes in prompt communication and that quality is key.

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Jenne Portillo

Jenne Portillo, NEBB CPT CT, has roughly 10 years of industry experience in cleanroom performance and indoor critical environment testing. She is the PNW Program Manager at VTG, LLC. and works closely with all team members to implement and improve programs to achieve overall growth and success in our industry. While focusing on CPT, Jenne is working towards getting her Cx and BET certifications to broaden her knowledge in the overall industry.

As a carpenter, Jenne started her career in the cleanroom industry by joining a team and was able to learn the methodology of cleanroom construction. Years later, this experience would apply to all testing of critical environments. Starting in Texas and now living in the PNW, Jenne has been able to work with customers all over the country (and even the globe), meeting all needs and expectations given.

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Samuel Kincaid

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Brenda Ineson

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