1. Bertel Bruun was a naturalist, international conservationist and neurologist.

1. Bertel Bruun was a naturalist, international conservationist and neurologist.
Bertel Bruun later became very involved in conservation efforts, most especially in the Middle East where he served as a liaison between the Israel and Egypt to promote the preservation of wildlife in the Sinai Peninsula when the region was handed back to Egypt after the 1978 Camp David Peace Treaty.
Bertel Bruun grew up in the Danish fishing village intending to follow his own father's career as a village doctor.
Bertel Bruun had grown up in Occupied Denmark during World War II.
Bertel Bruun took a special pride in the fact that his oldest brother and father were active members of the Danish Resistance.
Bertel Bruun attended the University of Copenhagen for his undergraduate studies and medical school, completing his studies there in 1964.
Bertel Bruun then moved to New York City where he served his internship at Lenox Hill Hospital and residency at Columbia Presbyterian Hospital.
Bertel Bruun became a practicing neurologist in association with Lenox Hill, Columbia Presbyterian, and Harlem Hospital.
Bertel Bruun conducted research on the neurological impact of heroin on the human brain in the early 1970s.
Bertel Bruun later became head of the Columbia Presbyterian stroke center.
Bertel Bruun went birding on weekends and vacations, often working in his study to late hours researching his books.
Bertel Bruun sought to expand the work in Israel to the fuller mission of advancing conservation in the Middle East.
Bertel Bruun retired as a neurologist in 1989, having suffered several strokes.
Bertel Bruun subsequently wrote a definitive guide to the niche industry called The Toy Soldiers Identification and Price Guide in 1994.