ヘルシンキ・フィルハーモニー管弦楽団
Katrama became a member of the Helsinki Philharmonic Orchestra in 1959, and was its principal bassist from 1967 until 1999; he is currently retired from the orchestra. He teaches at Sibelius Academy and travels to hold master classes in many countries. He established the Finnish Double Bass Society and the Finnish Piping society, "The Midnight Sun Pipers".