His rare non-comedic film roles include two collaborations with Andre Gregory and Louis Malle : the semiautobiographical dialogue My Dinner with Andre , and a combined production-and-backstage-drama of Uncle Vanya titled Vanya on 42nd Street . Shawn quite often appears on television, where he has appeared in many genres and series. He has had recurring roles as the Grand Nagus Zek in Star Trek: Deep Space Nine , Stuart Best in Murphy Brown , Jeff Engels in The Cosby Show , Dr. Howard Stiles in Crossing Jordan , Arnie Ross in Taxi , Charles Lester in The Good Wife , and a reprisal of his role as Mr. Hall in Clueless (based on the film). He appeared in the 1985 music video for Chaka Khan 's "This is My Night". On February 4, 2010, Shawn appeared as Alan Rubin in The Daily Show with Jon Stewart . He appeared in Vegas Vacation (1997) as Marty. Shawn's latest film opened in his birthplace in New York in June 2014 titled A Master Builder . 
I believe so. In its beginning, dialogue’s the easiest thing in the world to write when you have a good ear, which I think I have. But as it goes on, it’s the most difficult, because it has so many ways to function. Sometimes I needed to make a speech do three or four or five things at once—reveal what the character said but also what he thought he said, what he hid, what others were going to think he meant, and what they misunderstood, and so forth—all in his single speech. And the speech would have to keep the essence of this one character, his whole particular outlook in concentrated form. This isn’t to say I succeeded. But I guess it explains why dialogue gives me my greatest pleasure in writing. I used to laugh out loud sometimes when I wrote it—the way P. G. Wodehouse is said to do. I’d think of some things my characters would say, and even if I couldn’t use it, I would write the scene out just to let them loose on something—my private show.