http://www.variety.com/article/VR1118032235
Mars was a pure delight in The Producers - "I am ze author, you are ze audience, I outrank you!" is one of my favourite lines ever. Also, wonderful in Young Frankenstein and What's Up Doc? He was one of the truly great character actors, IMHO - I always happy to see him in any movie.
R.I.P., Kenneth Mars - thanks!