Our Team

Our company has grown to employ over forty experts. Below are profiles of some of our key personnel, including contact and branch info.

Mark W. Metzgar, AAIA – CEO

Principal
Lehigh Valley Office

mmetzgar@cornerstonenet.com

Mr. Metzgar serves as the corporation’s Chief Executive Officer and has been involved with building and site designs for over twenty years. His vast experience with a variety of corporate and private clients, lends a valuable resource to Cornerstone’s clientele.

John B. Anderson, P.E. – COO

Principal
Philadelphia Office

janderson@cornerstonenet.com

Mr. Anderson serves as the Chief Operational Officer and a active Professional Engineering Manager as a Principal Partner of Cornerstone. Mr. Anderson is responsible for the coordination, management and design of numerous multi-faceted projects, inclusive of commercial, residential and industrial developments. John’s 20 years of Engineering experience with project design and permitting are essential to the development of our client’s projects. His areas of expertise specifically lie in procurement of zoning, land development and building permit approvals; hydrologic modeling studies; flood studies; wastewater conveyance and treatment designs, DOT design and permitting; DEP NPDES and conservation district designs and all other aspects of design as required by Cornerstone’s clients.

Lester M. Stein, AIA

Principal
Lehigh Valley Office

lstein@cornerstonenet.com

As a seasoned veteran of the design industry, Mr. Stein has been offering professional architectural services for over 40 years. Mr. Stein’s experiences offer the knowledge needed to serve Cornerstone’s diverse client base. Mr. Stein’s career in architecture has included multitudes of municipal and educational facility designs not to mention countless commercial and residential facilities.

Kevin H. Fruck, P.E.

Professional Engineering Manager
Lehigh Valley Office

kfruck@cornerstonenet.com

Mr. Fruck handles the management of the Lehigh Valley Office’s civil engineering department, thus providing excellent account / project management, plan review, expert hearing testimony, and extensive project design for a variety of residential, commercial and industrial projects in the Mid-Atlantic region. Types of projects range from program work to large scale, planned, residential and commercial lifestyle and retail centers, and include all aspects of Zoning, site plan and layout design, grading, storm-water management and utility design and construction plan preparation.

Stephen J. Romich, PLS

Professional Survey Manager
Lehigh Valley Office

sromich@cornerstonenet.com

Mr. Romich serves as a Professional Surveyor with years of field experience. He brings an energetic, and business oriented attitude to the profession. Steve’s role within the firm is to coordinate the survey teams for all offices to assure our clients are being served in a timely and efficient manner. His special attention to customer satisfaction and enjoyment of client interactions make him an essential part of the Cornerstone team.

Leslie A. Cunningham, PE

Professional Engineering Project Manager
Philadelphia Office

lcunningham@cornerstonenet.com

Ms. Cunningham serves as an engineering project manager. Ms. Cunningham has brought a level of excellence through her skills in the preparation of residential, commercial and industrial projects in the Mid-Atlantic region. She has provided services including excellent project management support, plan review, hearing testimony, zoning, site design, grading, storm-water management and utility design. Ms. Cunningham’s attention to detail and design practices have contributed to Cornerstone’s continued growth, development and client base.

Anthony T. Brunkan, PE

Professional Engineering Project Manager
Philadelphia Office

abrunkan@cornerstonenet.com

Mr. Brunkan serves as project management, civil engineering design, permitting and regulatory compliance in support of myriad development and re-development projects throughout the Mid-Atlantic region. His experience includes large and small scale commercial, residential and mixed-use development projects. Mr. Brunkan’s commitment to client’s goals in conjunction with his knowledge of all aspects of site development and design make him a valuable asset to any project team.

Richard J. Deskie, AIA, NCARB

Architectural Project Manager
Lehigh Valley Office

rdeskie@cornerstonenet.com

Mr. Deskie serves as the lead Architectural Manager out of Cornerstone’s Lehigh Valley Office. His responsibilities include but are not limited to coordination and management of office staff including architectural designers, drafters, in-house mechanical and structural engineers. His supervision encompasses all phases of design including concepts, preparation of construction documents and construction contract administration. In addition, his multiple registrations throughout the Eastern and Mid-Atlantic states allow the firm to provide design services for clients in multiple commercial building markets.

Andrew Roth, RA

Architectural Project Manager
Lehigh Valley Office

aroth@cornerstonenet.com

Mr. Roth has experience in education, corporate, industrial, retail and health care building types and has been involved in phases of architectural services from initial programming, conceptual design, space planning studies, construction documents through construction administration to final inspections and close-out of projects. The scope of projects involves mall tenant improvements, corporate office space planning and renovations, to a large high school campus additions and renovations.

Tina R. Gahagan, PE

Professional Engineering Manager
Lehigh Valley Office

tgahagan@cornerstonenet.com

Ms. Gahagan serves as a Professional Engineering Manager, in charge of the structural engineering department of the Lehigh Valley Office. Specific duties include structural building analysis and design using various construction materials and applicable codes for a wide range of educational, commercial, industrial, institutional, and residential projects. As Project Manager, she supervises client meetings, determines project feasibility; design, develop and implement projects; supervise designers, draftsmen and engineers, prepare construction drawings and specification for projects, coordinate projects with clients and perform construction administration.

Ilya M. Peyros, P.E.

Professional Engineering Manager
Lehigh Valley Office

ipeyros@cornerstonenet.com

Mr. Peyros serves the management of the Cornerstone Consulting Mechanical Engineering Department, where he oversees all aspects of HVAC Engineering and Design, providing project management, plan review and extensive project design for a variety of commercial, residential and industrial projects. This includes new construction as well as renovation and expansion of existing facilities.

Jeremy D. Boyer, PM

Architectural Project Manager
Lehigh Valley Office

jboyer@cornerstonenet.com

Mr. Boyer manages one of Cornerstone’s architectural design teams focused on corporate offices and restaurant design. His team works alongside clients from the initial concept and design development stages through construction administration. Mr. Boyer also serves as the Allentown office’s permit expeditor, maintaining strong communication with government officials to ensure timely delivery of project approvals and permits.

C. Jason Kupski, PM

Architectural Project Manager
Philadelphia Office

jkupski@cornerstonenet.com

Mr. Kupski’s past experiences with the regional structural engineering division of one of the worlds leading concrete shoring companies provided him with an unparalleled understanding of client expectation & deadline management, not to mention technical ability. Additionally Mr. Kupski has developed an extensive restaurant design background assisting our franchise clients in layouts while maintaining a strong pension for daily operation and function. Mr. Kupski was one of Cornerstone’s initial employees, and through his hard work and dedication he is a manager that is paramount to our clients success in development.

Jason L. Best, PM

Architectural Project Manager
Lehigh Valley Office

jbest@cornerstonenet.com

Mr. Best’s past experiences with various corporate clienteles provide him with an unparalleled understanding of client expectation, timeframe management, and technical ability. Mr. Best has developed a diverse design background, assisting our franchise clients through all phases of design and construction.

Marianna B. Tlush

Office Manager
Lehigh Valley Office

mtlush@cornerstonenet.com

Ms. Tlush currently oversees the general management of the Cornerstone administrative team. With a Business Administration degree and over 20 years of office and financial management, Marianna oversees the entire administrative staff.

Jena L. Diefenderfer

Office Administrator
Lehigh Valley Office

jdiefenderfer@cornerstonenet.com

Ms. Diefenderfer handles all invoicing, interoffice correspondence and gathers all the needed information for incoming clients. In addition to office duties her knowledge extends into marketing to new clients and projecting the Cornerstone image. Her knowledge and experience make her a valuable asset to the Cornerstone team.