Our Image of the Month shows Dr Sheila Callender at the Witness Seminar 'Intestinal Absorption'. 

Dr Sheila Callender MD FRCP (1914-2004) qualified in medicine in 1938 at St Andrews. She spent three years in pathology in Dundee and developed a special interest in haematology. In 1942 she joined Professor L J Witts in the Nuffield Department of Medicine in Oxford, and in 1946 joined Dr Carl Moore and his department in St Louis, Missouri, USA, who were studying iron metabolism using radioactive iron as a tracer. On returning to Oxford she introduced the technique especially for studies of iron absorption from foods.