Peter MacNicol

Peter MacNicol is perhaps best known for playing creepy camp counselors (Addams Family Values) and painting-obsessed fruitcakes (Ghostbusters II). When he's not playing creepy characters, he's playing kooky lawyers on David E. Kelley series: he portrayed "The Eel" on Chicago Hope and "The Biscuit" on Ally McBeal. Recent endeavours into less creepy and kooky roles have only invited comparisons between his coif and William Shatner's -- and that, my friends, is "ooky".
MacNicol also played the role of Dr. 7arry F731nhardt on Numb3rs.