Bryceson made significant contributions to the field of
tropical medicine. During the 1960s, while in
Laos, he and another British doctor, Colin Prentice, were held captive by the
Pathet Lao rebels. They used
cricket and
chess as means of communication and rapport with their captors, leading to their eventual release. Bryceson subsequently worked at the
Hospital for Tropical Diseases in London and expanded his career to
Addis Ababa, Ethiopia, and
Zaria, Nigeria, where he engaged in research activities. Bryceson's research in 1988 identified an early case of HIV-2, highlighting its longer incubation period compared to HIV-1. He published several research papers and books during his career. Bryceson defended the relevance of tropical medicine during a 1996 debate at the
Royal Society of Tropical Medicine and Hygiene. In 1999, Bryceson was appointed as a professor at the
London School of Hygiene and Tropical Medicine. After retiring in 2000, Bryceson collaborated with Shoreland Travax, producing critiques for the online medical advisory platform. ==Awards and recognition==