Anderson Gray McKendrick was born in Edinburgh in 1876, the son of the physiologist John Gray McKendrick. He trained in medicine at the University of Glasgow, graduating MB ChB in 1900, and undertook further study in embryology, physiology, and anatomy in Jena. McKendrick served in the Indian Medical Service from 1905 to 1920, rising to the rank of Lieutenant Colonel and acting as Director of the Pasteur Institute in Kasauli during the First World War. Alongside his medical career, he pursued advanced study in physical chemistry and mathematics, developing a distinctive interdisciplinary approach. In 1920, McKendrick became Superintendent of the Research Laboratory of the Royal College of Physicians of Edinburgh. Working with chemists and mathematicians, he made influential contributions to the mathematical modelling of epidemics and population dynamics, showing how biological interactions could be analysed using methods analogous to those of physics. McKendrick died in 1943.

George Reginald Edward Gray Mackay was born in Edinburgh in 1886. He graduated MB from the University of Edinburgh in 1909 and entered military service, becoming a Captain in the Royal Army Medical Corps by 1915. He became a Member of the Royal College of Physicians of Edinburgh in 1914 and was elected a Fellow in 1918. Mackay died in Surrey in 1965.

William Maule Smith received his medical education at Edinburgh and Dundee, graduating in 1887 and MD in 1906. He became a Member of the Royal College of Physicians of Edinburgh in 1900 and was elected a Fellow in 1919. Smith held appointments at the asylums in Polton, Wakefield and Worcester, before serving as Medical Superintendent of the Union Infirmary, West Bromwich, and as Medical Officer to the Wigmore Schools and the Hallam Street Infirmary. He contributed numerous articles on neurological subjects to leading medical journals and was a member of the British Medical Association. He died in West Bromwich in 1925.

Samuel Burnside Boyd Campbell was born in India in 1890, the son of Irish Presbyterian missionaries. He was educated at Foyle College, Londonderry, and the University of Edinburgh, qualifying MB in 1912. After completing resident appointments at the Royal Infirmary of Edinburgh, he entered practice in Belfast. On the outbreak of the First World War he volunteered for the 36th Ulster Division and served with the 108th Field Ambulance, RAMC, being awarded the Military Cross in 1918. He became a Fellow of the Royal College of Physicians of Edinburgh in 1919 and pursued a long career in cardiology at the Royal Victoria Hospital, Belfast. He retired to Ballycastle in 1954 and died on 28 February 1971.

William Robertson Logan studied at the University of Edinburgh, graduating MB ChB in 1909 and MD in 1913. During the First World War he was Officer in Charge of the laboratory at the 42nd General Hospital, Salonica, researching dysentery and disease among Allied troops. After the war he obtained a Diploma in Public Health from the Universities of Edinburgh and Glasgow and practised clinical bacteriology at the Royal Infirmary of Edinburgh. He was Vice-President and Secretary of the Section of Pathology and Bacteriology of the British Medical Association in 1927. His publications include 'Reports of the M. and H. Laboratories Dealing with the Diseases Affecting the Troops in the Dardanelles' (1916) and 'Study of Pneumococcus and Streptococcus Groups in Their Relation to Influenza' (1921).

Maurice Gilbert Hannay was born in 1875 and educated at Abingdon Grammar School. He entered Charing Cross Hospital as a medical student in 1894, obtained the Conjoint qualification in 1900 and MD (Brussels) with honours in 1907. After general practice he specialised in dermatology, serving as Clinical Assistant at Charing Cross Hospital and the Victoria Hospital for Children. He was instrumental in founding the London School of Dermatology at St John's Hospital for Diseases of the Skin and became its first Dean. Hannay was elected a Fellow of the Royal College of Physicians of Edinburgh in 1919 and died on 24 October 1924.

Thomas Arthur Ross was born in Edinburgh in 1875, the son of Thomas Ross, LLD. Educated at Edinburgh Academy and the University of Edinburgh, he graduated MB CM in 1897 and MD in 1901. He served as Resident Physician and Surgeon at the Royal Infirmary of Edinburgh before entering practice at the Royal National Hospital for Consumption, Ventnor. In 1919 he was appointed Medical Director of the Cassel Hospital for Functional Nervous Disorders, Swaylands. He became a Fellow of the Royal College of Physicians of Edinburgh in 1919 and of the Royal College of Physicians of London in 1933. His works include 'An Introduction to Analytical Psychotherapy', 'The Common Neuroses and Their Treatment by Psychotherapy', and 'An Enquiry into Prognosis in the Neuroses'. He died in Westminster in 1941.

Robert Bathgate Johnston was born on 28 May 1875 in Glasgow. He became a Fellow of the Royal College of Surgeons of Edinburgh in 1904, a Member of the Royal College of Physicians of Edinburgh in 1912 and a Fellow in 1919. He held early posts at the Royal Infirmary of Edinburgh, Simpson Memorial Maternity Hospital and Chalmers Hospital, and served as Demonstrator of Anatomy at the Edinburgh School of Medicine. During the First World War he served as a Major in the RAMC at the 81st General Hospital. He later practised in London before retiring to Southern Rhodesia, now Zimbabwe, and died in Harare in 1959.

Leo Ferdinando Bianchi was born in Tunbridge Wells in March 1865. Educated at St Augustine's College, Ramsgate, and HMS Worcester, he served as a midshipman in the Royal Naval Reserve and with the Hooghly Bengal Pilot Service. Retiring on health grounds, he later studied medicine in Edinburgh, qualifying LRCS Edin and LRFP&S Glas in 1904. He served as Non-Resident House Physician at the Royal Infirmary of Edinburgh and practised in Joppa and Portobello. He died in Portobello on 17 January 1929.

William Hughes registered to practise in London in 1903 and was elected a Fellow of the Royal College of Physicians of Edinburgh in 1920. He served as a Captain in the Royal Army Medical Corps and later worked in Japan as Professor of Medicine at the Japanese Medical School, Tokyo, and Lecturer in Clinical Medicine at Charity Hospital, Tokyo. He was also Physician to the British Embassy in Tokyo and Medical Adviser to the War Office and Indian Army. His publication includes 'Value of Antistreptococcal Serum in the Treatment of Influenza' (1919).