One of the fascinating features of jazz and dance band musicians of the 1920s is what we have called here the iceberg effect, 10 % known, 90 % submerged in the unknown past. Jack Mollick is a good example. If we only had recorded output and jazz discographies, we would have stated that Jack make a number of recordings in the 1920s with Fred Hall, and that would be all. Thanks to the internet and to Jack's granddaughter Rikki, we now know about Jack's distinguished career in the the 1930s and 1940s.
PS One of the postings mentions that Ray Mitchell in his Eddie Lang discography gives Mannie Klein, Jack Mollick, tpts for the Nov 23, 1931 Bing Crosby recording of Where the Blue of the Night. Any further news about this? If confirmed, I will add this piece of information to Jack's webpage.