[9] Waldemar Lech Olszewski was born on 3 September 1931 in Piastów, Warsaw, Poland into a family of landowners, his father was a linguist and a banking specialist.
[10] Olszewski later worked at the Medical Research Center, Polish Academy of Sciences[11][12] (Head of Dept) and Ministry of Internal Affaires Clinical Hospital, Warsaw, Poland (Chief Consultant).
[13] Olszewski received postgraduate training and carried out research studies at Hammersmith Hospital, London from 1962 to 1963, then at Harvard Medical School in Boston, United States of America, from 1968 to 1970.
Other professional positions include Visiting Professor at Radiumhospitalet, Oslo, (since 1976-), St. Bartholomew's Medical School, London (since 1994-), Research Officer World Health Organization, Madras-Pondicherry-Benares, India (since 1992-).
[14] Olszewski served as a member of editorial boards of many international medical journals, including:[15][16] Main scientific contributions include designing and introducing into clinical practice the surgical lympho-venous shunts (1966), discovery of spontaneous rhythmic lymphatic contractility in humans (1980), proving that bacterial factor is responsible for development of human limb lymphedema (1994),[19] introducing low-dose, long-term penicillin administration for prevention of chronic dermatitis and lymphangitis in Asian countries (1996), detecting the phenomenon of non-specific elimination of cell grafts (1990), preservation of tissues for transplantation in dehydrating sodium chloride (2003).