After graduation, he founded Line Skiboards, set up shop in his parent's garage, and set to work perfecting his design. He then convinced the best athlete he knew, Mike Nick, to ride for him. He started Line Skis, LLC in 1995 because he was tired of lugging a pair of skis and a snowboard each time he went riding.
Ski boards are mini-skis roughly as long as conventional skis and twice as wide.
They are short enough to skate on and sport a snowboard appearance with side cuts for carving. Levinthal became a media darling during the 1998 media X-games, in part because his business was forged from a college senior project, and his skiboards took gold and bronze in the event's slopestyle competition. He always knew that he would work for himself. He describes himself as extremely self-motivated, and wants the freedom to control his own destiny. He says that in his free time, he works.