There are too many Allens in New York!If this connects to your tree, please let me know.He's my ggrandfather. Here's some info about him:
MAJOR JOHN E. ALLEN, M.D., Assistant-Surgeon, Veteran Association
John E. Allen, M.D. is a native of New York City, born Nov. 1, 1847.He was educated at Mount Pleasant Military Academy, now known as the College of the City of New York.He entered Bellevue Hospital Medical College, from which he was graduated in 1874.He passed a brilliant examination and was admitted to the Staff of Bellevue Hospital, serving as house physician during 1874-1976.In April 1876, he went to Europe, continuing his medical studies in Vienna, Paris, and London.He returned in 1878 and was appointed Assistant Demonstrator of Anatomy in Bellevue Hospital Medical College.
He was commissioned Captain and Assistant Surgeon of the 71st in October 1874, and served until January 12, 1883.He was then appointed Surgeon of the regiment, with the rank of Major.He resigned this position in 1884.He did not accompany the Battalion to New Orleans in 1881, on its famous “Mission of Peace,” but received “Royal Honors” from “Rex,” the King of the Carnival.”
Dr. Allen joined the Veteran Association in 1879, and was soon after elected Assistant Surgeon, which position he still holds.
He is a member of St. John’s Lodge No. 1, F. & A. M. of New York.He is Surgeon-in-Chief of the New York and Mexican Steamship Line.
In 1079 he married Madame Mavrocordato, whose first husband was a nephew of the Prime Minister of Greece.
Dr. Allen is a man of generous impulses, free-hearted, and exceedingly popular among his military and other associates.Professionally he ranks among the most prominent physicians in the city, and enjoys an extensive and lucrative practice among some of the best families.
From: History of 71st Regiment, N.G.S.N.Y (1850-1886) Including the History of the Veteran Association with Biographical Sketches of Members By: Henry Whittemore. Published by: Willis McDonald & Co. 25 Park Row, New York, 1886 Pages 225-226: