Christian Keimann
German hymnwriter and rector
Christian Keymann (also Christian Keimann; 27 February 1607 – 13 January 1662) was a German hymnwriter. He is known for writing the chorale "Meinen Jesum laß ich nicht" in 1658, which served as the base for Bach's chorale cantata Meinen Jesum laß ich nicht, BWV 124, and other compositions.
Read more about this composer on Wikipedia.