About Northside Auto & Truck Service in Watertown, WI
Northside Auto & Truck Service Crew
Northside Auto is a full-service preventive maintenance and auto repairs center in Watertown, WI, specializing in a range of auto repairs and services for cars, trucks, vans and fleets which include: heating and cooling, transmissions, electronics, internal engine, heavy-duty, towing, undercar and more.
Our experts have the knowledge and skills to service and repair even the most challenging auto problems on all makes and models of domestic and import vehicles. We use the latest technology to assess the situation and offer you alternatives. We guarantee all of our work and know you'll be happy with the outcome. Stop in or give us a call at
to let us know how we can help you today!
Meet Our Staff
Owner/Certified Master Technician / Mechanic
John Mason grew up in Beaver Dam, Wisconsin, and has been around the automotive industry almost all of his life. In high school, he worked at the local gas station, gaining knowledge and hands on training at an early age. John then attended UTI in Chicago after high school, studying all areas of automotive.
Before opening his own business, John worked for a number of auto shops throughout the Watertown area including a Chevy dealership as an auto technician. After a few years, John felt he could take everything he had learned both in shop and in school and open up an auto shop of his own.
In 2000, John officially opened the doors to Northside Auto & Truck Service in Watertown, WI, working by himself at first and hiring employees along the way. Along the years, Northside Auto & Truck Service expanded to a full auto repair facility and has recently doubled in size.
Greg A. Nass
Greg A. Nass will be taking on service technician duties at Northside Auto Service on Hwy. L, just one mile north of Watertown. Greg brings over 19 years of automotive repair experience to Northside Auto. He graduated from Madison Area Technical College in December of 1995, and has had much updated training along the way. He is currently an ASE (Automotive Service Excellence) Certified Master Technician. Greg began his new position on Monday, August 26, 2013. John Mason, owner of Northside Auto said “Greg is known for being extremely Dependable, Knowledgeable and Honest. We at Northside Auto are very excited about him coming on board. He will be an asset to our operation and help us to deliver the highest quality customer service possible, as we expand our business.”
Ryan was born and raised in the Deerfield Wisconsin area. He has been working in the customer service industry since the young age of 16. With over 14 years of experience, including managing Valvoline in Madison, he is here to help make your experience at Northside Auto a great one!