Gebrüder Hillebrand Orgelbau, located in Altwarmbüchen, Germany, is renowned for its meticulous restoration of historical organs in Northern Germany. Founded by Hermann Hillebrand (1904-1966), who trained in Hanover under Lothar Wetzel and later took his master craftsman examination with Emil Hammer Orgelbau, the company began operations in 1948. Hermann’s sons, Harry (1930-1987) and Guntram (1934-1991), trained in organ building and eventually took over the company, managing it until their respective deaths. Since 1978, the company has operated under the name "Gebrüder Hillebrand GmbH Orgelbau KG."

Martin Hillebrand, Hermann's grandson, became the managing director in 1992, bringing extensive experience from working with various notable organ builders such as Metzler Orgelbau and Marcussen & Søn. Under his leadership, the company continues its legacy, and his son Nikolas has joined as the fourth-generation organ builder. The company, awarded the Lower Saxony Culture Prize in 1986, also participated in a research project aimed at reducing lead corrosion in organ pipes from the 17th and 18th centuries.

https://de.wikipedia.org/wiki/Gebr%C3%BCder_Hillebrand_Orgelbau