In 2012 , he wrote , directed and starred in his second film , '' Liberal Arts '' , which premiered at the 2012 Sundance Film Festival . In 2014 , Radnor portrayed Isaac in the Broadway play '' Disgraced '' , which earned a Tony Award for Best Play nomination . He then starred as Dr. Jedediah Foster on the PBS American Civil War drama series '' Mercy Street '' and as Lou Mazzuchelli in the musical series '' Rise ''
2012 Sundance Film Festival
2012 Sundance Film Festival
Josh Radnor