A pioneer in bringing jazz to Denmark. Visited USA first time in 1934 and over several visits connected with a large number of jazz personalities. Rosenkrantz establsihed three Danish labels during the 78 RPM era, Embassy (10), Baronet and New York. His large personal collection of jazz records and recordings and own photographs has been donated to the Danish SDU University in Odense.
Married to US jazz singer Inez Cavanaugh