Johann Martin Schmid (1847-1923) was a prominent German organ builder who continued the legacy of the Schmid family in Oldenburg, following in the footsteps of his father, Johann Claussen Schmid, and grandfather, Gerhard Janssen Schmid. From 1881 until 1919, he managed the family business before it was taken over by the Rohlfing company. Even after the company's transition, Schmid remained active in the field, continuing to undertake various organ modifications until his death.

Schmid was responsible for numerous new organ constructions and modifications, particularly in the Oldenburg region, with over 60 projects attributed to him. His approach often involved significant alterations to historical organs, adapting their design to contemporary tastes. However, these changes, which included adding more fundamental registers to soften the sound of older instruments, are often viewed critically today. His work on the organ by Joachim Kayser in Hohenkirchen is a notable example, where his modifications replaced the original bright and distinctive tonal character with a more subdued sound. Despite the controversy surrounding his work, Schmid played a crucial role in shaping the organ landscape of his time in the Oldenburg area.

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