Joachim Kayser (died 1720) was an organ builder who lived in Jever from 1674 until his death. He was active in building and modifying numerous organs in the regions of East Frisia, Oldenburg, and Jeverland. Despite the competition from prominent organ builders like Arp Schnitger, Kayser was able to establish himself in the local organ-building landscape, particularly after receiving a privilege in 1699 from Duke Karl Wilhelm, which allowed him to work in the Jeverland region.

One of Kayser's most significant works is the organ in the St. Sixtus and Sinicius Church in Hohenkirchen, built between 1694 and 1699. This instrument, with its impressive double-towered façade and original pipework, remains largely intact and was restored to its original state by the Alfred Führer company in 1974. Kayser was involved in several other notable projects, including the construction of organs in Westerstede and Schortens, although many of his works have not survived in their original form.

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