Brent Lang Executive Editor of Film and MediaWhen the Gotham Award nominations were announced this week, Reed Birney was the sole member of the “Mass” ensemble recognized for his work in the searing drama about two couples grappling with the aftershocks of a school shooting. Some prognosticators were surprised that Birney and not Ann Dowd or Martha Plimpton, who have more emotional, galvanic moments in the film, made the cut for his pared down and minimal performance.