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He was born in 1945 as a son of the music teacher, pianist, and organist Alexander Kroll. He began to compose his first piano pieces at the age of eleven and from 1957 to 1959 wrote a Symphony in G minor for full orchestra. He studied in Rochester, New York, and German literature at Yale University, obtaining a doctorate in 1973 on the subject of the German writer Klaus Mann.
Since 1969, he has lived in Germany, where he has worked since 1976 on a six-volume biography of Klaus Mann. In 1974 he was active as a teacher at the Carl von Ossietzky High School in Hamburg - Poppenbuettel. In 1988 and 1989 he served as a training representative at the German seminar of the University of Freiburg in Breisgau. He has also lived and worked occasionally in Brazil.
Series of publications on Klaus Mann (publisher and co-author), 6 vol., Wiesbaden, 1976, Hamburg, starting from 2002 (ISBN 3-88179-003-9, ISBN 3-88179-004-7, ISBN 3-928427-03-2, ISBN 3-88179-009-8, ISBN 3-928427-05-9)