Meet Some of Our Team Members

AMS Mechanical Systems Headquarter
Meet the team

John Berzanskis Jr.

Chairman of the Board

Direct Number: 630.320.7712

John is second generation of ownership and has served as the President of AMS for 40 years until the company transitioned into an ESOP. Currently, John serves as the Chairman of the Board and works very closely with the management team in strategic planning and business development. During his tenure as owner and President John served in a number of roles within AMS helping build the company from a small refrigeration company into a multi-disciple and multi-market MEP contractor. John firmly believes in the founder’s mentality where people and integrity come first.
Throughout his forty years in the industry, John has served on the Board of Directors for MCA, the JATC Committee, PEC Trustee and Arbitration committee and is truly committed to giving back to his industry.

Benjamin Campbell


Direct: 630.320.7790


Ben began his career with AMS in 2003 after graduating from the University of Wisconsin – Madison with a degree in Mechanical Engineering. Throughout his career, Ben has served many roles within AMS including estimating, mechanical design, project management, and senior leadership. He became President in 2017 with a focused dedication to excellence in customer satisfaction and project quality. As President, Ben is responsible for setting the vision for AMS as the company grows and evolves to serve our customer’s needs while maintaining the principals on which AMS was founded: People, Integrity, Safety, Stewardship and Excellence.

Daniel Panice

Daniel Panice

Executive Vice President

Direct: 219.554.7555

Dan Panice comes with a broad background in construction management operations and is responsible for the day-to-day operations. Qualified in hiring project managers, writing contracts, and helping design construction plans. Daily serves in a hands-on role in nearly every aspect of construction management projects. Responsible for hiring and supervising the project management team, as well as creating and managing budgets.

Michael Roberts

Chief Financial Officer

Direct: 630.320.7700


Mike has served in his current role as the chief financial officer since 2001. Previously, he began his career in public accounting and has since worked in the construction industry for 20+ years. He is a graduate of Illinois State University and is a certified public accountant.

Mike Roberts
Tom Kelleher

Thomas Kelleher

Vice President Energy & Environment

Direct: 630.320.7723


Tom has been in the commercial/industrial construction game since receiving his Bachelor of Science in Mechanical Engineering in 1977. His degree is intertwined with his field experience as a pipefitter. Along the way, Tom picked up his Illinois Professional Engineer’s License and a LEED AP accreditation. He has accompanied AMS on our journey since 1989. Working on elite level projects of sheer importance like HVAC, high/low-pressure steam systems, water treatment plants, and hospital retrofits. Promoted to Vice President in 1994, he continues to demonstrate his excellent selection for this role by making his leadership, skills, and experience available to the employees of AMS. In addition to his role at AMS, Tom has served on the Illinois ASHRAE Board of Governors and currently is a board member for the Mechanical Contractors Association. At home, Tom is the chairman of the Village of Western Springs Infrastructure Committee.

Eric Evans

Executive Vice President Plumbing and Commercial 

Direct: 630.320.7748

Eric brings over 25 years of plumbing experience as a member of Plumbers Local 501/130. He has been involved in many projects throughout his career including retrofits, riser replacements, new construction, design-build, hospitality, food service, renovations, and service. Through design and specifications, to installation, he recognizes the importance of the customer’s needs and expectations to deliver a quality system of value on time and within budget.

Eric Evans
Rick Watters

Richard Watters

Vice President Industrial Refrigeration

Direct: 630.320.7741

Rick brings 35+ years of experience as a member of Pipefitters Local 597. He has been involved in numerous refrigeration and food process piping projects including retrofits, new construction, design-build, renovations,
and service. From concept to completion he recognizes the importance of the customer’s needs and expectations to deliver a quality system of value on
time and within budget.

William Montgomery

Vice President Business Development

Direct:  630.320.7773


A B.S.M.E. degree from Illinois Institute of Technology would be the catalyst that set William Montgomery’s focus on Mechanical Piping. Entering the industry in 1971, Bill has been involved in the design and construction of major facilities such as hotels, health care facilities, residential towers, data centers, and major office buildings. Becoming the AMS Vice President of Business Development in 2001, Bill’s career has continued to be just as exciting as it has to watch his superior leadership in action.

Bill Montgomery
Bob Dobbins

Robert Dobbins

Executive Vice President Client Services

Direct: 630.320.7785

Robert is a proven industry leader. His dynamic career spans over 32 years experience working for owners/developers directly, third-party management firms, GC/CM, and Mechanical Contractors. His core competencies include Facility Operations, Operations/Property Management, Commercial Construction Management, MEP Management, MEP Contracting and Systems Integration.

Craig Cox

Vice President Technology

Direct: 630.320.7706

Craig brings over 30 years of IT related job experience to the table. He began his career in the mid 80’s starting out as a service manager specializing in hardware and software support related to PC based installations. Over the years, he has successfully completed countless vendor certifications, played a key role in the installation of networks ranging in size from 5 – 2500 nodes located in businesses and K-12 districts throughout the Chicagoland area. Application development and network security are just a few of the many skills he brings to AMS. Craig also paralleled his IT career with serving over 15 years in the law enforcement community.

Craig Cox
Tim Riordan

Timothy Riordan

Vice President Mission Critical Group

Direct: 630.280.2390



Tim comes to us with over 30 years of HVAC & Plumbing Project
Management, and Business Development experience related to Data Centers, High Rises, Hospitals, Federal / State Government Projects, and Airports.

Joseph Emerson

Quality Assurance Manager

Direct: 630.320.7754


With proficiency & leadership in all aspects of Quality Control, training, manuals, and work procedure development, performance-based auditing and surveillance. In-depth knowledge of industry standards, ensuring that products or services meet established standards. Maintaining the efficiency and profitability of the organization by reducing waste; inspect and maintain products using documented processes and prepare quality data and records to a recognized standard.

Joe Emerson
Mark Rook

Mark Rook

Safety Director

Direct: 630.320.7795

Extensive Occupational Safety & Health experience in the construction industry, Safety inspection and auditing, and class instruction/training of employees. Capable of managing all health and safety program initiatives across the company to maintain a safe, healthy workplace for all employees. This includes the development of a safety strategy and ownership of the departmental budget. Qualified in managing all internal and external relationships as they relate to government requirements and internal policy compliance.

Mary Witt-Bruce

Human Resource Director

Direct: 630.320.7708


In July of 1996, Mary joined our team at AMS. Originally hired as an Administrative Assistant, in 1997 she became Executive Assistant to the President and moved into the Office Management/Marketing/HR role. In 2015 she was promoted to the HR Director and is responsible for all of the policy, education programs and compliance for this department. Mary is actively affiliated with National SHRM (Society of Human Resources), DuPage County and IL SHRM as well as the Chair of the MCA of Chicago HR committee.

Mary Witt-Bruce