Searching for biographical information about Herbert Cornell I came upon this page:
Would my assumption that Herbert Cornell is a pseudonym of composer Harry Bergström be right?
It seems that not. We could not find any references about that. We checked some databases: Fono, Suomen äänitearkisto, Viola. Although Harry Bergström (1910-1989) has several pseudonyms: Gerald Beach, Harold G Burgess, Leonard Fleuvemont, Sointu Karikas, Lenny, Jorge Monterio, Tintti-Kalle
And unfortunately we couldn't find any information about that whose pseudonym is Herbert Cornell.
Hope you will find what you are looking for!