Profile
Mark C.
Williamson served as Chairman at Putnam Roby Williamson Communications from 2012 to 2018.
He was an Independent Director at Orion Energy Systems, Inc. from 2013 to 2022.
Prior to that, he was the Chief Strategic Officer & Executive Vice President at Madison Gas & Electric Co. from 1986 to 2002.
He also served as Vice President-Major Projects at American Transmission Co. LLC from 2002 to 2008.
Williamson is a graduate of the University of Washington Law School.
Former positions of Mark Williamson
| Companies | Position | End |
|---|---|---|
| ORION ENERGY SYSTEMS, INC. | Director/Board Member | 2022-11-09 |
| Putnam Roby Williamson Communications | Chairman | 2017-12-31 |
American Transmission Co. LLC
 American Transmission Co. LLC Electric UtilitiesUtilities American Transmission Co. owns and operates the high-voltage electric transmission system. It provides electric transmission services in portions of Wisconsin, Michigan, Minnesota, and Illinois. It serves electricity producers and electric distribution companies. The company was founded by José M. Delgado in 2001 and is headquartered in Waukesha, WI. | Corporate Officer/Principal | 2007-12-31 |
Madison Gas & Electric Co.
 Madison Gas & Electric Co. Electric UtilitiesUtilities Madison Gas & Electric Co. generates and distributes electricity and natural gas. The company was founded in 1896 and is headquartered in Madison, WI. | Corporate Officer/Principal | 2001-12-31 |
Training of Mark Williamson
| University of Washington Law School | Graduate Degree |
Experiences
Positions held
Connections
1st degree connections
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Listed companies | 1 |
|---|---|
| ORION ENERGY SYSTEMS, INC. | Electronic Technology |
| Private companies | 3 |
|---|---|
Madison Gas & Electric Co.
Madison Gas & Electric Co. Electric UtilitiesUtilities Madison Gas & Electric Co. generates and distributes electricity and natural gas. The company was founded in 1896 and is headquartered in Madison, WI. | Utilities |
American Transmission Co. LLC
American Transmission Co. LLC Electric UtilitiesUtilities American Transmission Co. owns and operates the high-voltage electric transmission system. It provides electric transmission services in portions of Wisconsin, Michigan, Minnesota, and Illinois. It serves electricity producers and electric distribution companies. The company was founded by José M. Delgado in 2001 and is headquartered in Waukesha, WI. | Utilities |
| Putnam Roby Williamson Communications |
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