His birth name, birth & death dates are uncertain. Checked NLA E-resources, Wikipedia, IMDB, Google. 1899-1951 assigned by LC.
NOTE: Not to be confused with American composer & actor, "Smith, Jack C., 1895-1944" whose works were published under Jack Smith, also another American singer & film actor, "Smith, Jack, 1913-2006".
The Whispering baritone [SR] 1975 (a.e.) label (Jack Smith) on container (Whispering Jack Smith, 1899-1951)
Give me a little kiss, will ya, huh?, c1926 caption (by Roy Turk, Jack Smith and Maceo Pinkard)
Wikipedia, viewed 22/06/2011 (Jack Smith (b. 31/May/1898, The Bronx, N.Y. ; d, 13/May/1950, N.Y.) was known as "Whispering" Jack Smith and was a popular baritone singer in the 1920s and 1930s who made a brief come-back in the late 1940s. He was a popular radio and recording artist who occasionally appeared in films. Smith was born John Schmidt.)