NY: 718-824-1616 | PA: 610-865-2674 | NJ: 609-298-3255 info@certifiedtestinglabs.com Mon-Fri: 7am to 5pm
NY: 718-824-1616 | PA: 610-865-2674 | NJ: 609-298-3255 info@certifiedtestinglabs.com Mon-Fri: 7am to 5pm

Our Team

Calisto Bertin - President

Calisto Bertin is a licensed professional engineer with over 40 years of experience in engineering design and construction oversight of civil and structural projects in the northeastern United States.  He has also designed projects and prepared engineering studies in Ontario, Canada and Abu Dhabi, UAE.


Mr. Bertin’s introduction to concrete began at a very young age working in the family concrete and masonry business where Calisto gained over a decade of experience mixing mortar, cement and concrete for construction projects.  After earning his engineering degrees, in 1978, he became a construction engineer for Westvaco Corporation, an industrial paper manufacturer where he oversaw the construction and quality control of concrete and steel structures including power plant turbine generator replacements.  This included concrete field testing similar to that of an ACI-Grade 1 Technician, and concrete construction Special Inspector.

In 1980, Mr. Bertin joined Exxon Company, USA where he served as a project engineer managing the construction of bulk and retail petroleum facilities.  After obtaining his professional engineering license in 1984, Calisto moved into design consulting, first working for a small firm; and then opening Bertin Engineering in 1986.  For over 30 years he serves as the chief civil and structural engineer designing commercial and residential developments.  His experience in concrete design includes retaining walls, culverts, specialty foundations and low-rise buildings.  He also performs the evaluation of structures, the forensic investigation of failed structures, and the development of rehabilitation programs to restore structures.

In 1998, while maintaining his role at Bertin Engineering, Mr. Bertin acquired and continues to serve as the chairman of Johnson Soils Company, a geotechnical engineering and testing company.  It also performs the design of deep and shallow foundations.  He expanded their services to include Special Inspection of concrete reinforcing, and field concrete testing and placement.

In 2020, Mr. Bertin performed the design and oversaw the construction and AASHTO accreditation of a concrete testing lab for C&L Construction Testing.


Villanova University, Villanova, PA                            B.C.E. – Civil Engineering

Rensselaer Polytechnic Institute, Troy, NY                M.S. – Civil Engineering


American Society of Civil Engineers

National Society of Professional Engineers


New York, New Jersey, Connecticut, Massachusetts, New Hampshire and Rhode Island

Maureen McLennon - Chief Operating Officer

Maureen McLennon is the Chief Operating Officer (COO) for Certified Testing Labs, Inc. She is a CPA with over 25 years of experience.
Maureen is responsible for NY operations and CTL’s corporate financials. She has an MBA in Business Management from Trinity College (Dublin Ireland) and a BA in CPA Accounting and Information Systems from Pace University, Lubin School of Business (Pleasantville, NY). Maureen joined CTL in 2018.

Kirt Dobbins - Professional Engineer and Director, NJ & PA

Mr. Dobbins is a Professional Engineer and certified in NY, NJ and PA. He joined CTL in 2013 and oversees all technical aspects of operations at the Bronx Branch. Prior to joining CTL he served as a Structural Engineer at Linde Engineering North America. His experience spans Project Management, Engineering, Construction Management and Product Development. He has an MS in Environmental Technology from the New York Institute of Technology and a BS in Civil Engineering from Northeastern University in Boston.

Lori Sergent - General Manager, Bethlehem

Lori Sergent joined Certified Testing Labs as a secretary in 1996. Through focus and strong effort she advanced to Office Manger and now serves as the General Manager of CTL’s Bethlehem location. Lori is responsible for leading and directing office and lab personnel and managing daily operations. She holds an Associate’s degree in Science and is a Pennsylvania Notary Republic.  While working full-time at CTL, she continued her education by studying Nutrition part-time at Cedar Crest College.

Darryl Schultz - NDT Manager NY, NJ & PA

Darryl Schultz is the Non-Destructive Testing (NDT) Manager and Radiation Safety Officer (RSO) at CTL’s Bordentown, NJ facility. Darryl has been CTL’s RSO for the last fourteen years and has over twenty-eight years of NDT experience.  He is responsible for supervising all NDT personnel, radiation safety training, the implementation of CTL’S radiation safety program, and the maintenance and calibrations of surveying and monitoring equipment. Darryl has been with CTL since 1996 and holds current certifications with AWS (American Welding Society) as a CWI (Certified Welding Inspector) and CRI (Certified Radiographic Interpreter), ASNT (American Society of Non-Destructive Testing) as a Level III in Visual Testing (VT), Magnetic Particle Testing (MT), and Penetrant Testing (PT), ICC (International Code Council) as a Structural Steel, Bolting and Welding inspector and is trained in Radiation Safety & Hazmat.

Terry Kifer - General Manager, Bordentown

Terry Kifer serves as the General Manager of CTL’s Bordentown, NJ branch. He has thirty years of experience in the construction field and is both trained and certified in many facets of testing and inspections including geotechnical, concrete, structural steel and investigations. Terry is responsible for leading and directing office and lab personnel as well as managing daily operations. Terry joined CTL in 1987 as a field and lab technician and advanced to Lab Manager before taking over the reins as GM.

Vladimir Sirota - P.E. Technical Director

Vlad is a licensed professional engineer in NY State with over 40 years of experience in design and project management. He obtained a mechanical engineering degree from Polytechnic Institute in Ukraine.

After graduation he was working as a Mechanical (machines and mechanisms), Structural, Sheet metal, HVAC Design Engineer and
Engineering Manager for various projects internationally. The last 10 years he has been working as a Technical Director for a Special Inspection Agency in New York.