He is a two-time national champion and as such represented the United States at the 2008 and 2018 World Men's Curling Championships.

As Team United States at the 2008 World Men's Championship, they finished the round-robin with 5–6 record, missing the playoffs and ending the tournament in seventh place.

His 2018 gold medal team included Greg Persinger, Colin Hufman, and Philip Tilker.

At the World Championship they finished in sixth place when they lost their first playoff game to Brad Gushue's Team Canada.

In 2019 when Ruohonen returned to the national championship to attempt to defend his title, he brought along Jared Allen, retired NFL player, as an alternate.