Here are links to some Tai Chi friends who are also in the Cheng Man-ch’ing tradition.
Steve Goodson has classes in Wash., D.C.
He trained with R. W. Smith and others.
Joanne Chang has classes in Rockville, MD.
She trained with David Chen, Arnold Lee and others.
Wolfe Lowenthal has classes in Amherst, Mass., etc.
He studied with Prof. Cheng in New York City in the 1980s
and wrote “There Are No Secrets” about his time there.