berlin

"Max Reinhardt (September 9, 1873 – October 30, 1943) was an Austrian-born theatre and film director, intendant, and theatrical producer. With his innovative stage productions, he is regarded as one of the most prominent directors of German-language theatre in the early 20th century. In 1920, he established the Salzburg Festival with the performance of Hofmannsthal's Jedermann." en.wikipedia.org/wiki/Max_Reinhardt Photo by Nicola Perscheid. "Nicola Perscheid (3 December 1864 – 12 May 1930) was a German photographer. He is primarily known for his artistic portrait photography. He developed the "Perscheid lens", a soft focus lens for large format portrait photography." en.wikipedia.org/wiki/Nicola_Perscheid Wikimedia indicates this portrait is from 1911

Thanks for the information about both the subject and the photographer. We'll add to the description at our end.

He was married to Else Heims, here seen as Cassandra in the Oresteia by Aeschylus .

www.wikidata.org/wiki/Q100712139

"German Field-Marshall Paul von Hindenburg gathered with his family on the occasion of his 70th birthday in 1917. Left to right: Hindenburg's son in law Christian von Pentz, Annemarie [Barbara Ilse Ursula Margarete Eleonore] von Pentz (neé Hindenburg), Mrs. von Hindenburg, Hindenburg, "Irmengard [Pauline Louise Gertrud] von Brockhusen (neé Hindenburg)."
de.wikipedia.org/wiki/Paul_von_Hindenburg#/media/File:Hin...
see also de.wikipedia.org/wiki/Paul_von_Hindenburg#Familie :
" From this marriage the children Irmengard Pauline Louise Gertrud (1880-1948), Oskar (1883-1960) and Annemarie Barbara Ilse Ursula Margarete Eleonore (1891-1978) emerged. The older daughter married in 1902 Hans Joachim von Brockhusen (1869-1928), the younger 1912 Christian von Pentz (1882-1952) and the son 1921 Margaret of Marenholtz(1897-1988).

"Paul Ludwig Hans Anton von Beneckendorff und von Hindenburg, known universally as Paul von Hindenburg; 2 October 1847 – 2 August 1934) was a Prussian-German field marshal, statesman, and politician, and served as the second President of Germany from 1925 to 1934.
Hindenburg enjoyed a long career in the Prussian Army, retiring in 1911. He was recalled at the outbreak of World War I, and first came to national attention, at the age of 66, as the victor at Tannenberg in 1914. As Germany's Chief of the General Staff from 1916, he and his deputy, Erich Ludendorff, rose in the German public's esteem until Hindenburg gradually gained more influence in Germany than the Kaiser himself."
en.wikipedia.org/wiki/Paul_von_Hindenburg
"Gertrud Wilhelmine von Beneckendorff und von Hindenburg (born December 4, 1860 in Magdeburg, † May 14, 1921 in Hannover) was a German noblewoman and philanthropist. She was the wife of Paul von Hindenburg, the Chief of the German Army Command in the second half of the First World War and President of Germany."
en.wikipedia.org/wiki/Gertrud_von_Hindenburg

commons.wikimedia.org/wiki/File:Hindenburgfamily0001.jpg is another URL for the same picture. Anne Marie and Christian had four children. See de.wikipedia.org/wiki/Christian_von_Pentz_(Offizier). Irmengard and Hans-Joachim Adalbert Gotthilf von Brockhusen had three sons. See www.geni.com/people/Hans-Joachim-von-Brockhusen/600000000...

Art Siegel Thank you for locating the photograph from which this negative was copied identifying those present.