Curtis Retherford is an improvisor from New York City. He moved to New York City in 2006 to take classes at UCB. He has taken classes from, or been coached by, just about everyone.
Curtis writes sketches for his Youtube Channel, which goes by the descriptively uncreative name Curtis Retherford's YouTube Channel.
He has more stuff at CurtisRetherford.com or at his Tumblr.
For more information on Curtis Retherford, consult your local library.