Bernard Katz

Sir Bernard Katz (26 March 1911 – 20 April 2003) was a German-born British biophysicist renowned for his pioneering discoveries on the mechanisms of neurotransmitter storage, release, and inactivation in nerve terminals, particularly the quantal theory of acetylcholine release at the neuromuscular junction. His work, shared with Ulf von Euler and Julius Axelrod, earned him the 1970 Nobel Prize in Physiology or Medicine for elucidating how humoral transmitters function in synaptic transmission, fundamentally advancing understanding of nerve-muscle communication and influencing fields like pharmacology and neuroscience. Katz's research demonstrated that neurotransmitters are packaged in synaptic vesicles and released in discrete quanta upon nerve impulses, providing a quantitative basis for synaptic efficacy.13835-4/fulltext)

Born in Leipzig, Germany, to Russian-Jewish parents Max Katz, a fur merchant, and Eugenie Rabinowitz, Katz grew up in a cultured household and attended the Albert Gymnasium from 1921 to 1929. He pursued medicine at the University of Leipzig from 1929 to 1934, earning his M.D. in 1934 with the Siegfried Garten Prize for his thesis on nerve physiology in 1933. Facing rising antisemitism, Katz fled Nazi Germany in February 1935, arriving in London where he joined A. V. Hill's laboratory at University College London (UCL) as a research assistant; there, he completed his Ph.D. in 1938 and D.Sc. in 1942. From 1939 to 1942, he served as a Carnegie Research Fellow at Sydney Hospital in Australia, collaborating with J. C. Eccles and S. W. Kuffler on neuromuscular transmission, before enlisting as a radar officer in the Royal Australian Air Force during World War II, where he became a naturalized British citizen in 1941.

Bernard Katz was born on March 26, 1911, in Leipzig, Germany, as the only child of Max Katz and Eugenie Rabinowitz Katz. His father, Max (1882–1971), was a fur trader originally from Moghilev in the Russian Empire (now Belarus), who had emigrated to Leipzig around 1904–1906 to escape antisemitism and established a successful fur shop that provided economic stability for the family. His mother, Eugenie (1889–1983, née Rabinowitz), was of Polish Jewish origin, born in Warsaw to a Polish mother and a German father, and had moved to Leipzig in 1909; the couple married in Vienna that year.

The Katz family was Jewish and resided in a well-to-do Jewish quarter of Leipzig at 13 König-Johann-Straße, above their fur shop and a bakery, enjoying a comfortable middle-class life amid a liberal, unorthodox household environment. However, as Russian subjects until the 1917 Revolution—which rendered them stateless—the family faced early encounters with antisemitism in pre-Nazi Germany, including economic and social prejudices that foreshadowed broader challenges for Jewish communities. Katz later recalled a happy childhood in this setting, living near the future Nobel laureate S. Y. Agnon from 1918 to 1924, though incidents like a rumored 1920s plan to gas Jews in Leipzig instilled awareness of societal tensions at a young age.

During his studies, Katz conducted independent physiological research that earned him recognition. In 1933, he won the Siegfried Garten Prize for his work on the excitation and contractions of heart muscle, submitting his entry under the pseudonym Johannes Müller to circumvent emerging restrictions on Jewish students; however, due to his non-Aryan status, the award was not publicly presented, and he received it privately later. This achievement, based on experiments exploring muscle responses, underscored his budding expertise in electrophysiology. The following year, in November 1934, Katz completed his M.D. degree with a thesis titled "Bioelectric Phenomena in Muscle," supervised by J.D. Achelis and drawing on publications in Pflügers Archiv that examined electrical properties of muscular tissue. Following his degree, Katz served briefly as a house physician at the Eitingon Jewish Hospital in Leipzig from late 1934 until February 1935.