Between 1885 and 1900, he developed friendships with Wilhelm Leibl, Johann Sperl, Max Liebermann, with the entrepreneurial family Steinbeis (owners and operators of the Wendelstein Rack Railway) and others.
He developed friendships with Wilhelm Leibl Max Liebermann. This was between 1885 and 1900. This was with the entrepreneurial family Steinbeis (owners and operators of the Wendelstein Rack Railway). This was with others. Wilhelm Leibl was Johann Sperl.