To become a successful fighter, physical attributes like strength and endurance are essential. But it’s the mental side of things that’s even more important, requiring traits like courage, discipline and determination.

Alex Swiderski possessed all of the above when he enjoyed a relatively brief, but successful boxing career as a teenager in the 1950s. When he hung up his gloves to take over his family’s business in Mosinee, Wis., in 1964, all of those traits continued to serve him well.

A Fighter’s Focus

The Swiderski family business celebrated its 100th anniversary in 2025. The company started off as a horse training and selling operation before branching into rubber tires, Minneapolis-Moline tractors and New Holland hay equipment in the 1930s. They even dabbled in the car business for a while.

Alex’s brothers were running the company in the 1950s while Alex was living in California with their parents; their father suffered from asthma and Alex was helping care for him. Alex was also creating quite a name for himself in the boxing ring.

Alex came home to visit family in 1959. The family business was at a crossroads. One of Alex’s brothers, the late Joe Swiderski, asked him to partner with him to try and keep the business going. Alex agreed. But a couple years later, Alex had the opportunity to start boxing again and assumed the role of silent partner in the business.

Within a couple more years, Alex returned to the family business for good. Joe had started another business roughly 60 miles away. Alex came home assess the business they owned together.

“Too many things felt wrong,” Alex says. “I talked things over with my wife, Dianne, and decided we needed to move back to Mosinee and take over the business. We did that in 1964.”

With Alex now at the helm, business continued to grow throughout the 1960s. They added several new equipment lines and also started selling cattle. The company name was changed to Swiderski Implement & Livestock. Eventually, Alex decided that his company needed to be entirely focused on equipment. The business name changed a couple more times, finally landing on Swiderski Equipment Inc. (SEI), which has carried through to this day.


I could take a good punch as a boxer, but I wasn’t all that fast or smooth. I was a brawler. I was rugged. That’s how I approached business. The harder you work, the luckier you can get…


Prior to becoming a business owner in his early 20s, Alex’s love was boxing — and he was very good at it. He also had a knack for landscaping and blacktopping, though he couldn’t see himself making a living in those fields for the rest of his life. Sales, on the other hand, was something he loved just as much as boxing.

“I used to buy and sell scooters when I was living in California as a teenager,” Alex says. “I really enjoyed that. I liked making deals.”

Alex brought that deal-making focus to his now equipment-focused company. He wanted to become known as the place to go for great deals on great equipment, new or used. He also wanted central Wisconsin farmers to know that nobody would go the extra mile like he would.

Market Dominance

SEI continued to expand its equipment offering and gain market share throughout the 1970s. SEI’s broad equipment selection (roughly 40 brands today) and large used equipment inventory have been two of its biggest differentiators. Then, a series of 4 acquisitions from 1987-1997 cemented SEI as the powerhouse farm equipment dealer in central Wisconsin.

Alex says he was already looking around for opportunities to build additional locations throughout the region. Once that word got out, some of his competitors began reaching out.

“Some of those dealers just got tired of having to fight us on price,” Alex says. “The owner of Marathon Implement in Wausau said I should buy his place instead of putting up another building. I told him to put a price on it. I went up there and looked around, and I bought it. Then a couple other opportunities came up with dealers who were struggling or maybe even going broke.”