
Sir Edgar Speyer, 1st Baronet (7 September 1862 – 16 February 1932) was an American-born financier and philanthropist. He has an extensive Wikipedia page
which details his career as a financier and also his connections with various composers including Edward Elgar, Richard Strauss and Claude Debussy.
He was also involved in the financing of Captain Scott's Antarctic expedition.
Speyer was the victim of anti-German sentiment at the start of World War 1 and lost his status as a naturalised Briton in 1921 following an investigation into business links with Germany. Friends and partners denied any wrongdoing but he moved to the United States in 1921.
Speyer died in February in 1932, having travelled to Berlin for an operation on his nose.
Leonora Speyer is an equally interesting lady in her own right. She was an accomplished violinist and poet - winner of the 1927 Pulitzer Prize for poetry, for 'Fiddler's Farewell'. 
This beautiful portrait was painted by John Singer Sargent, whose name is a common thread in
the address book. Read more about her here.
Here is link to
another picture of Leonora which she dedicates in her own hand to Edvard Grieg.
The townhouse at 22 Washington Square now houses The Strauss Institute - for the advanced study of law and justice.
Th Institute's website has a thorough history on the house, including this paragraph (by Lauren Gambier) about Speyer's residence there: 22 Washington Square was home to Edgar and Leonora Speyer from 1919 to 1936. The house was purchased by Speyer in 1919 for $22,000.
The couple (pictured on the left) had three daughters. One of them, Vivien Claire Speyer, died in 2001, aged a formidable 94. Her
obituary details a commendable war effort, spent in London during the blitz and lists her as one of the first WAACs. At the end of the war she had reached the rank of sargeant.