CEO of Eden Prairie-based Tennant Co. retiring after 15 years Chris Killingstad will be succeeded by Dave Huml. By Patrick Kennedy Star Tribune December 15, 2020 — 7:20pm Text size Copy shortlink: He will be succeeded by Dave Huml, the Eden Prairie-based manufacturing company's chief operating officer. "Dave Huml's promotion to CEO is a natural progression that reflects his successful leadership at Tennant, including his role as a major architect of the company's current enterprise strategy," said lead director Steven Sonnenberg in a news release. Killingstad will remain with Tennant as a strategic adviser until the end of next year. "With his leadership, Chris helped transform Tennant into the innovation leader that we are today in the mechanized cleaning industry," Sonnenberg said.