There is more information available on this subject at Jay Leno on the English-language Wikipedia.

Jay Leno is a comedian who is one of the recurring guest celebrity voice actors on The Fairly OddParents. He voices the Crimson Chin and his evil counterpart the Nega Chin. He also guest stars as himself in Lights...Camera...Adam!. He is best known for the late-night talk show on NBC he hosted, The Tonight Show with Jay Leno.