After gaining recognition as an actor, writer, and director at film festivals like Sundance and SXSW, indie favorite Alex Karpovsky prepares to take on Tribeca for the first time, with lead roles in two films that will debut at the fest this year. TFF hosts the world premieres of both “Rubberneck”—which the actor also directed and co-wrote—and “Supporting Characters” on Friday, April 20.