Nachspiel

August Wilhelm Bach. 4 October 1796 – 15 April 1869

He studied with his father, Gottfried, as well as with Carl Friedrich Zelter and Ludwig Berger as well as at the Singing Academy in Berlin. In 1816 he served as an organist at St Mary's Church and from 1820 he taught organ and music theory at the Institute of Church Music set up by Zelter. In 1832, Bach succeeded Zelter as the director of the Royal Institute of Church Music in Berlin. He also taught at the Prussian Academy of Arts. His compositions largely consist of sacred works and works for keyboard. He also wrote a pipe organ method and a hymnbook.

I consider his main claim to fame he was the organ teacher of Felix Mendelssohn, who studied with him on the Joachim Wagner organ at St. Mary's Church in Berlin. Thanks to VoceUmana for that info.

https://www.thediapason.com/sites/diapason/files/webFeb10p24-292.pdf

He is unrelated to the family of Johann Sebastian Bach.