Los Angeles-based Riot Games, a venture backed developer of online games, said Wednesday that it has added Jarl Mohn to its board of directors. Mohn is an investor in the firm. Mohn was the founder of E! Entertainment Television, and was also founding president and CEO of Liberty Digital. He has also served at MTV, VH-1, and on the board of Scripps Networks Interactive. Riot Games is backed by online Chinese services firm Tencent, Firstmark Capital, Benchmark Capital, as well as angels Mitch Lasky and Rick Heitzmann. The company's first title is League of Legends, an online role-playing and strategy game.