TerWisscha Construction, Inc. (TWC, Inc.) has been providing professional services from architectural design to construction services since 1963. The ingenuity and integrity that TWC team members possess has given them the reputation of being the leading source for the markets they serve; Veterinarians, Dental Professionals, and Funeral Directors. TWC has over 40 employees and two office locations, with the main headquarters located in Willmar, MN, and a sales office in Sunbury, PA. Our History TWC was started in 1963 by John TerWisscha in Willmar, MN. The company started as a local, residential construction firm and transitioned into the commercial market in 1970. Upon retiring in 1996, John TerWisscha sold the company to his son, Kelly TerWisscha, and son-in-law, Keith Nelson. Once in the commercial market, TWC decided to focus on niche markets in order to become experts in these niche markets. Today, TWC works within the Veterinary, Death Care, General Dentistry, and Oral Surgery markets.