Answer: No. Despite TNA and MMA Uncensored in 2012 claiming that Bellator fighter 'King Mo' Lawal is the first person to do both MMA and Pro Wrestling at the same time this is actually false. UFC Hall of Famer Dan "The Beast" Severn is the first person to do both Pro Wrestling and MMA at the same time dating back to 1995. Dan Severn competed for the UFC, WWF (now WWE), and NWA as well as other promotions simultaneously. In fact, Dan Severn (pictured below) is the only man to hold both an MMA and Pro Wrestling Championship at the same time (Severn held the NWA World Championship and the UFC Superfight Championship simultaneously).
Bobby Lashley also competed in MMA and Pro Wrestling simultaneously from 2009-2010 competing for TNA Wrestling at the same time he was fighting for Strikeforce, Maximum Fighting Championship, and PFP: Ultimate Chaos.