Muhammad Ali, c. 1970, Gordon Parks, courtesy of the Howard Greenberg Gallery, New York, N.Y. DOYLESTOWN, PA.- Elvis is in the house and Ali is in the ring. Two of our nation's most well-known icons—"the King of Rock 'n' Roll" and "the Greatest"—meet at the James A. Michener Art Museum in Doylestown, Pa., February 19 through May 15. Ali and Elvis: American Icons, features two photography exhibitions: the Smithsonian's Elvis at 21 and art2art's Muhammad Ali: The Making of an Icon. Elvis at 21 is sponsored nationally by HISTORY. Elvis at 21: Photographs by Alfred Wertheimer: Freelance photojournalist Alfred Wertheimer was hired by RCA Victor in 1956 to shoot promotional images of recently signed 21-year-old recording artist Elvis Presley. Wertheimer's instincts were to "tag along" with the artist after the assignment and the resulting images provide us with a look at Elvis before he exploded onto the scene and became one of the