British immunologist, Leslie Baruch Brent (1925-2019) was a key figure in the beginning of transplant research.

He was also a child refugee, one of the first children to travel from Germany to England as part of the Kindertransport rescue effort. Before he left Germany he spent 2 years in a Jewish orphanage in Berlin - his parents sent him there because he was being bullied at his local school. In England, he was in a refugee camp before being sent to Bunce Court School, a German-Jewish boarding school in Kent. Despite the separation from his family, Lothar (as he was then) was happy at the school. When he turned 18, Leslie joined the British Army. After he left the Army he went to the University of Birmingham to study zoology and began studying with biologist, Peter Medawar. The trio of Medawar, Brent and Rupert Billingham did groundbreaking work on immunological tolerance. Leslie Brent had several academic appointments, culminating in his appointment as Professor of Immunology at St Mary's Hospital Medical School, a role he carried out for 20 years.

Before he retired in 1990, Brent had published something like 200 academic articles. Then in 1997 he published a book on the history of transplation and in 2009, his memoir, Sunday's Child.