Management Team

Grant E. Johnson Grant E. Johnson, PE, President, Chairman of the Board
Grant is a Professional Engineer registered in 14 different states throughout the U.S. Grant has been President of Grant’s Mechanical, Inc. since it was founded in 1975.


Joyce Johnson Joyce Johnson, Board of Directors
Joyce has been with the company since March, 1981. She has extensive experience in Business Administration.


Paul Corcoran Paul Corcoran, Secretary/Treasurer, Board of Directors
Paul has a B.S. in Business Economics from North Dakota State University with an Associate’s Degree in Accounting. Paul is a member of CFMA, NRASP, and ABC. He has been with the company since March, 1979.


Paul Linstad Paul Linstad, Vice President
Paul has an extensive construction background and is one of Grant’s Mechanical’s Project Managers & Estimators. He has been with the company since April, 1985.


Steve Hoepfner Steve Hoepfner, PE, Project Manager
Steve is a graduate of North Dakota State University and has a degree in Mechanical Engineering. He is a professional engineer registered in the state of North Dakota. Steve has been with the company since May, 2008.

Marc Erbes Marc Erbes, Master Electrician, Project Manager
Marc has an Associate’s Degree in Construction Electricity. He has been a Master Electrician in North Dakota and Minnesota since 2001. He has been with the company since June, 2009.


Wayne Frisell Wayne Frisell, Assistant Controller
Wayne has a B.S. in Accounting with over 15 years of accounting experience. He has been with the company since December, 2011.


Clark Erickson Clark Erickson, Master Plumber, Project Manager
Clark has an Associate’s Degree in Plumbing and HVAC with over 30 years of plumbing experience. He has been with the company since July, 2001.


Allen Schimmel Allen Schimmel, Project Manager
Allen has an Associate’s Degree in Plumbing and Heating with over 12 years of plumbing and heating experience. He has been with the company since September, 2007.


Andrew Binstock Andrew Binstock, Project Manager
Andrew is a graduate of the Grant’s Mechanical, Inc. Apprenticeship Program. He has been with the company since September, 2007.


Paul Austin Paul Austin, Project Manager
Paul is a graduate of Grant’s Mechanical, Inc. Apprenticeship Program with over 15 years of Pipe Fitting experience. He has been with the company since August, 2001.


William Refling William Refling, EIT, Project Manager
William is a graduate of North Dakota State University and has a degree in Mechanical Engineering. William has been with the company since March, 2013.


Peter Roller Peter Roller, EIT, Project Manager
Pete is a graduate of North Dakota State University and has a degree in Mechanical Engineering. Pete has been with the company since January, 2014.


Zach Larson Zach Larson, Project Manager
Zach has an Associate’s Degree in Construction Electricity with over 10 years of electrical experience. He has been with the company since April, 2007.


Angie Kisser Angie Kisser, Human Resources Generalist
Angie has a B.S. in Human Resources and Organizational Leadership along with an Associate’s Degree in Business Management. She is an active member of FMHRA and NRASP. She has been with the company since November, 2011.

Mark Robertsdahl Mark Robertsdahl, Company Superintendent
Mark has an Associate’s Degree in Business Management from North Dakota State School of Science. He has extensive experience as a Shop Foreman, Sheet Metal Fabricator, and Superintendent. He has been with the company since December, 1982.

Gerald Mackey Gerald Mackey, CAD Drafter
Gerald has a B.A. in Architecture. He has been with the company since March, 2014.


Carmen Berg Carmen Berg, Accounts Payable
Carmen has an Associate’s Degree in Accounting with over 20 years of experience in the accounting field. She has been with the company since March, 2013.


Shannon Wilhelmi Shannon Wilhelmi, Engineering Assistant
Shannon has an Associate’s Degree in Accounting. She has been with the company since April, 2013.