Johann Claussen Schmid (1811-1881) was a significant German organ builder who continued the legacy of the Schmid family in Oldenburg, primarily working in the Oldenburg region. He was the son of Gerhard Janssen Schmid, another well-known organ builder, from whom he learned the craft. After his father's death in 1845, Johann Claussen Schmid took over the family workshop and led it for over 25 years until his own death. His son, Johann Martin Schmid, then continued the family tradition.

Schmid was known for his numerous organ constructions and modifications, especially in alignment with the romantic preferences of his time, which often involved significant changes to existing historical instruments. These changes were later reversed by the Alfred Führer company in the 20th century. Schmid’s work typically included small village organs with a single manual and around seven stops, as well as two-manual instruments with under 20 registers. While none of his organs have survived completely intact, many of his facades and some individual stops remain. The most complete example of his work is the organ in Bardewisch (1859), and his instrument in Schwei was under restoration as of 2011.

https://de.wikipedia.org/wiki/Johann_Claussen_Schmid