Hadary's Broadway credits include Awake and Sing, All Shook Up, The Best Man, Guys and Dolls, Gypsy, As Is, Torch Song Trilogy and Gemini. His off-Broadway credits include God Bless You, Mr. Rosewater, Weird Romance, The Destiny of Me, Defying Gravity, 1,2,3,4,5 and the original production of Assassins. Hadary was in the national tour of Angels in America as Roy Cohn and has appeared in the feature films A Time To Kill, Private Parts, A Simple Wish, Bait, Intolerable Cruelty and upcoming Margaret.
Lovingly "ripped-off" from Monty Python and the Holy Grail, Spamalot is the winner of three 2005 Tony Awards including Best Musical and Best Director Mike Nichols.