EXCLUSIVE: Mark O’Brien (Your Honor) will exec produce and star in the coming-of-age drama Topper from 1A Motion Pictures and Bad Lad Productions, which has wrapped production in Detroit. Others set for major roles include Paul Johansson (God Is a Bullet), Amanda Clayton (City on a Hill), and actor-comedians Jimmy Shubert (Entourage), Bryan Callen (Warrior) and Erik Griffin (Workaholics).