San Francisco -- PlayFirst, a San Francisco-based developer of casual games, including the "Diner Dash" franchise, has named Mari Baker as its new CEO and Jim Wandrey as its CFO. Baker most recently served as the CEO of Navigenics, and previously was president of BabyCenter. Wandrey, meanwhile, served as the CFO of Telephia. Baker replaces PlayFirst co-founder John Welch, widely regarded as one of the leaders of the casual game revolution. Welch will be moving on to a new, yet to be disclosed venture.