Dr. Josua Moses Ehrenreich, who called himself Max since the end of the 1920s, was born in Bad Kissingen on April 30, 1879. His father Elieser Lazarus Ehrenreich was the teacher and cantor of the Jewish Community of Bad Kissingen. Together with his wife Dina, née Lonnerstädter he founded a restaurant which developed into the kosher restaurant and hotel Ehrenreich at the corner of Kurhausstrasse and Lindesmühlpromenade. Later it was relocated into Theresienstrasse and a boardinghouse was added. It belonged to the most renowned Jewish hotels in the spa town.

Josua Moses was the fourth of seven siblings. Between 1889 and 1891, he first attended two classes of Kissingen Realschule, studied medicine in Würzburg, specialized on gastrointestinal diseases and after finishing his studies worked in Berlin and Bad Kissingen as a physician and specialist of internal and X-ray medicine. In 1919, he married Dr. Elfriede Wolkiser, who was also a doctor. Their oldest son was born in Berlin in 1920 and his younger brother Arthur Ralf Jon in Bad Kissingen in 1922. Between 1926 and 1937, the couple practiced in the capital of the Reich in winter and in Bad Kissingen in the summer months, first in Ludwigstrasse and then in Kurhausstrasse. In May 1927, he took on the medical management of the newly opened sanatorium section of Hotel Ehrenreich which was run by his sister Rifka Jeidel. In September 1937, the Ehrenreichs moved to Berlin for good and emigrated with their children to the USA. In Berlin, Max Ehrenreich had been a doctor at the Charité Hospital and published several scientific papers as a lecturer at Berlin University.

In January 1938, he emigrated to New York with his son Norbert, in the next year his wife Elfriede and their younger son Ralph followed. After getting American citizenship, the family renamed themselves “Enrick”. Dr. Max Ehrenreich practiced as a doctor in New York for 15 years. After he had retired in April 1959, he died only few months later in November 1959 at the age of 79.