About Us

Leadership

Cornerstone Environmental Group, LLC, is led by a diverse group of environmental professionals, many of whom have worked together for more than 20 years. Each professional brings a unique set of expertise to our team as we serve our various markets with a variety of perspectives, including that of owners and regulators.

Cornerstone’s team of professionals, working together and with our clients, develops relationships that last a lifetime, through our commitment to incorporate integrity, insight and innovation into every aspect of our company.
"We put our people into leadership positions where they can direct and drive technical advancement within the company. This, in turn, enables us to better serve our clients." Ken Karl, President, Chief Operating Officer
Leadership is asked of every Cornerstone employee; however, we are presenting below our senior personnel responsible for managing the company and projects. Each of them would be pleased to answer any questions you have or give you more information on how Cornerstone can help.

Management Team  |  Operation Directors  |  Project Managers: Alternative Energy  |  Project Managers: Environmental/Remediation  |  Project Managers: Industrial  |  Project Managers: Organics  |  Project Managers: Solid Waste

Management Team

Kenneth J. Karl
President, Chief Operating Officer
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James J. Bradley, Esq.
General Counsel
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David Damon
Chief Financial Officer
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Adam Larky, PE
Region Vice President, Central
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Mike Michels
Michael S. Michels, PE
Executive Vice President, Business Development
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Prentiss Shaw, PE
Region Vice President, East
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Paul Stout, PE
Region Vice President, West
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Mark Torresani, PE
Vice President
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Operation Directors

Garth Bowers, PE
Senior Operations Director - West
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Maura Dougherty, PE
Operations Director West
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Julie Hall, EIT
Operations Director Central
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Robert Holmes, PE
Robert Holmes, PE
Operations Director-East
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Donald Hullings
Operations Director East
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John Oswald, PG
Operations Director - Central
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Christopher Peters
Christopher Peters
Operations Director - Central
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Andrew Schellberg
Andrew Schellberg
Operations Director East
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Kari Wallover, PG
Operations Director Central
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Steve Wintheiser
Steve Wintheiser
Operations Director - Central
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Project Managers: Alternative Energy

Mike DiMaggio
Mike DiMaggio
Biogas & Landfill Gas
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Steve Wittmann
Steve Wittmann
Biogas & Landfill Gas
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Project Managers: Environmental/Remediation

Rich Calogero, LSRP
Environmental Planning
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Gary DiPippo, PE
Environmental Planning
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Michael Melan
Project Manager
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Paul Mutch, PE
Paul Mutch
Site & Civil Design
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Joseph Nemesh, PE
Joseph Nemesh, PE
Remediation
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William Soukup, PG
William Soukup, PG
Hydrogeology
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Kristen Thordahl, PE
Kristen Thordahl, PE
Site & Civil Design
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Kari Wallover, PG
Hydrogeology
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Craig Young, PE
Craig Young, PE
Landfill Engineering & Design
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Project Managers: Industrial

Carl Beuter, PE
Carl Beuter, PE
Site & Civil Design
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Tiffany L. Medley, Ph.D
Air Quality
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Scott Miller
Scott Miller
Air Quality
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Timothy Roeper, PG
Timothy Roeper, PG
Remediation
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Leslie Sparrow, PG, LSRP
Leslie Sparrow, PG, LSRP
Remediation
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Edwin Valis
Edwin Valis
Air Quality
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Project Managers: Organics

Jessica Bernardini, PE
Organics Management
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Maura Dougherty, PE
Organics Management
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Prentiss Shaw, PE
Organics Management
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Project Managers: Solid Waste

Matt Beebe
Matt Beebe
Biogas & Landfill Gas
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Patrick Bell, PE
Patrick Bell, PE
Site & Civil Design
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Tom Bilgri, PE
Biogas & Landfill Gas
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Matthew Boudreau
Air Quality
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Jennifer Bowyer
Landfill Engineering and Design
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Edwin Calvache
Operations & Maintenance
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Gavin Casson
Project Manager
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Mukonde Chama, P.E.
Air Quality
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Michael Contestabile
Project Manager
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Mick Cossairt
Senior Project Manager, Central Region
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Lee Daigle, PE
Sr. Project Manager
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Jennifer Deal, PE
Environmental Engineering
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Maura Dougherty, PE
Biogas & Landfill Gas
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Carl Eller, PE
Carl Eller, PE
Site & Civil Design
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Tyler Field
Project Manager
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Robert Fifarek, PE
Client Manager
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Julie Hall
Air Quality
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Robert Holmes, PE
Robert Holmes, PE
Site & Civil Design
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Donald Hullings
Client Manager
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Danielle Kirk, PE
Landfill Engineering & Design
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Kyle Kneser, PE
Operations & Maintenance
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Arie P. Kremen, Ph.D
Landfill Engineering & Design
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Mark Krieski, PE
Project Manager
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Khaled Mahmood, PE
Khaled Mahmood, PE
Air Quality
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Rachelle Maxheimer, PE
Rachelle Maxheimer
Air Quality
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Scott McCallister
Client Manager
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Jerry McGraner
Client Manager
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Magdalena Mendola
Project Manager
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Cyndi Neitzel, PE
Cyndi Neitzel, PE
Air Quality
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Daryl O'Dell, PE
Daryl O’Dell, PE
Biogas & Landfill Gas
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Suzan Pankenier
Suzan Pankenier
Air Quality
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Christopher Peters
Christopher Peters
Landfill Engineering & Design
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Ray Ramos
Ray Ramos
Air Quality
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Jared Romaine
LFG O&M/Small Construction
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Geed Salam, PE
Air Quality
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Tami Sands
Tami Sands
Air Quality
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Andrew Schellberg
Andrew Schellberg
Transfer, Recycling, & Processing Facilities
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Michael Schumaci
Operations & Maintenance
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Michael Skowronek, PE
Project Manager
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Robert Sochovka
Client Manager
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David Sonne
Site & Civil Design
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Brian Stone, PE
Site & Civil Design and Landfill Engineering & Design
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Mark Swyka, PE
Mark Swyka, PE
Landfill Engineering & Design
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James Wade, PE
Landfill Engineering & Design
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James Walker, PE
James Walker, PE
Landfill Engineering & Design
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Steve Wintheiser
Steve Wintheiser
Landfill Engineering & Design
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