Ole ?Fessor? Lindgreen (born 16. may 1938) is a Danish jazz musician.From 1956 he played with different traditional jazz orchestras, and in 1958 he became a member of Knud Rath?s big orchestra. After his military duty he toured with Danish groups in West-Germany, and in the years 1961-1966 he was a member of Ricardos Jazzmen. In 1968 he created his own orchestra, the Fessor?s Big City Band, which became his main focus. In 1995 he was awarded with the Ben Webster Award.