Our Experienced and qualified staff.


Steve Grundahl 

Founder / President

If you are unable to find Steve at Midwest, there's a good chance you can find him at the racetrack or working on his cars during the summer months. In addition to the full schedule that comes from running a company, Steve still spends plenty of time with his children, who will be sure to tell you he's "stronger than a squirrel."


Bill Isermann

General Manager

Outside of managing the business operations at Midwest Prototyping, Bill enjoys motorcycle riding throughout Wisconsin. He also fine tunes his golf swing at many of the local country clubs.



Mike Roosa

Business & Applications Development 

With quality fishing and numerous lake chains throughout the area, Mike spends his free time out on the water. Musky are his fish of choice, and when they're not biting, he spends time learning the game of golf.  



Trent Appleby

Production Manager

Trent spends a good deal of time hunting and fishing in his home state of Minnesota. He also brews his own specialty beer through trial and error.


Laura Mason

Project Coordinator

A veteran of the USMC and a graduate of the UW-Madison Business School, Laura is happy to be back at Midwest after a brief hiatus. Away from work, Laura enjoys spending time with her family and friends and being outdoors hiking, biking, and kayaking.  


Alfredo Jijon

Prototyping Specialist

Alfredo enjoys tinkering on various automotive projects during his free time. He also is involved in the Boy Scouts of America program.



Mitch Ziegler

Project Coordinator

Outside of work, Mitch can be found hunting or fishing. He's also a fan of board games and playing cards.


Ben Bollig

Additive Manufacturing Supervisor

Outside of work, Ben is a skilled woodworker and specializes in creating kitchen and coffee tables. He also enjoys exercising and biking during his free time.



Cheryl Kotlowski

Shipping Manager

Outside of Midwest Prototyping, Cheryl is involved in dog rescue organizations. She also enjoys spending time working with photography.


Nate Schumacher

Project Leader

Nate's interests include entrepreneurial ideas and business processes and can be found entertaining these ideas in his free time. He enjoys discussing technology, startups, and sports while enjoying a local microbrew.



Austin Butler

Account Manager

When Austin is not on the phone discussing projects with clients, he enjoys spending time with his daughters and coaching their many activities. He can usually be found on the soccer field or basketball court outside of work, or spending time with his family and friends.