he was a central part of Oslo's swing-jazz milieu, where he led his own Rowland Greenberg Swing Band (1939–41) with Arvid Gram Paulsen on sax, Lulle Kristoffersen on piano and Pete Brown on drums.
Gram Paulsen joined the orchestra at Oslo Swingklubb, and a new quartet with Lulle Kristoffersen and Pete Brown, under the leadership of Rowland Greenberg (1940).