This matador is Sidney Frumkin, born in 1903 on Jackson Place off 16th Street near Seventh Avenue. It seems that at the age of 19, Frumkin took off for Mexico after a fight with his police officer father, and on a whim, he looked up a famous matador and asked him how to wave the red cape.
Under the name Sidney Franklin, Frumkin wowed the crowd in Mexico City in 1923–his first ever fight. Over time, he became one of the top matadors worldwide and had a number of famous fans, including Ernest Hemingway.
”No history of bullfighting that is ever written can be complete unless it gives him the space he is entitled to,” Hemingway wrote.
-via The famous bullfighter who came from Park Slope « Ephemeral New York.