Derek Mincher

Project Manager

Formerly a landscaper, Derek started working for MIG in 2003 with little knowledge of construction. He spent many years working on houses of all sizes and styles, ranging from historical to contemporary. Derek’s knowledge and experience makes him a specialist in weatherizing and retrofitting existing homes with the best products on the market today. Derek meets with clients to assess their needs and develops custom-tailored insulation solutions, and gutter and gutter protection systems. When not working, Derek enjoys skiing, snowboarding, mountain biking, climbing Adirondack peaks, and traveling and exploring with his wife Allison and young son Mason.

Jamie Dunn

Project Manager

Jamie joined MIG in 2021. He began his career in building supplies while living in Vermont, where he met his wife. A business school graduate with over 20 years of work experience, this native upstate New Yorker brings customers a unique combination of formal education and real-world experience. He strives to supply personalized proposals that result in quality solutions, solid value, and timely outcomes. He enjoys spending time outdoors with his family and pets.

Stefanie Maciaszek

Project Manager

With MIG since 2011, Stefanie is our lead master suite design consultant. In this role, she handles designs and estimates for MIG’s custom closets, framed and frameless heavy glass shower enclosures. She works closely with clients to come up with the ideal solution for their unique needs, and then develops a virtual reality image of the design to give customers a clear view of the planned improvement. Stefanie went to school for broadcasting and journalism from Medaille College. Prior to joining MIG, she worked at a local branding and marketing firm. Her two children and husband keep her very busy. They enjoy camping, hiking, beach days, and getting together with family and friends.

John Geska

Collection Associate

John is a sales account manager and Owens Corning Certified Energy Expert. he has been an installation technician and sales representative for MIG for the past 37 years. He loves showing customers all the ways they can improve the comfort of their homes while educating them on the savings they can achieve. Prior to working for MIG, John spent six years in the United States Army. He then went on to work for four years as a part owner of his own insulation company. John has a great love for the outdoors, whether it’s camping, hunting, or fishing. He also loves to attend all kinds of sporting events.

Jan Williams

Employee Safety and Fleet Manager

Jan was hired by the company’s founder, David Williamson, and has been with MIG for over 40 years. Currently he serves as company fleet manager and employee safety manager. Jan also oversees the company’s credit card program. Prior to joining MIG, Jan received his bachelor’s degree from CCFL, framed houses, and did roofing. Jan has a great love for both football and his grandchildren.

Peter Carey

Retired After 47 years on 8/16/2024

Peter was hired in 1977 by MIG founder David Williamson. Fresh out of school, he started out sweeping the warehouse floor. Today Peter is a sales account manager, a position he has held for 35 years. Homeowners and builders alike rely on Peter’s experience and expertise to design and deliver solutions across all of MIG’s product line. Peter graduated from Rochester Institute of Technology. In Peter’s free time, he loves to downhill ski, golf, hunt, and travel. He also loves spending time with his family.

Marc Williamson

Regional Vice President

As Regional Branch Manager, Marc is responsible for all sales and production operations for 9 of Installed Building Products’ locations across the Northeast stretching from Buffalo NY to Cape Cod and down to Scranton PA. His ultimate goal? To ensure his hard-working teams are just as satisfied as their many customers. He graduated from the University of Vermont in 1992. Following college, he was an Audit Manager for KPMG Rochester, and eventually earned a role as CFO for American Building Systems. Outside of work, you can find Marc on the golf course, the ski slopes, or rooting for the South Carolina Gamecocks and the Buffalo Bills.