Production Advisor: George H de Mendelssohn-Bartholdy

Any relation to the composer of the well known violin concerto in E
minor?

Yes. But a distant one.

George H. de Mendelssohn-Bartholdy, the man who founded Vox, pointed
out that the hyphen in his name indicated he was a collateral, rather
than direct, descendant of the famous composer Felix Mendelssohn
Bartholdy. In the recording circles he was known simply as George
Mendelssohn, and, as many of his competitors readily acknowledged,
"the most remarkable talent-finder in the industry." Because he ran
Vox Productions as virtually a one-man operation for more than three
decades, and yet made it into something he knew would survive him, the
story of the company's first half-century is largely his story.

Read more at:
http://www.voxcd.com/vox_founder.html