Fleck was born on 11 November 1889, the son of Robert Fleck, coal-merchant of the firm Alexander Fleck & Co of 45 Hope Street, and his wife, Agnes Hendry Duncan. He was educated in both
Saltcoats and
Hillhead High School in Glasgow. He left school at the age of fourteen to become a laboratory boy at the
University of Glasgow. When
Frederick Soddy arrived as a lecturer, Fleck became his assistant. He studied at evening classes, eventually becoming a student of Glasgow University and graduating BSc in 1911. He then became a post graduate researcher, gaining a doctorate (DSc) in 1916 in the chemistry of radioactive substances. He was associated with the
Beatson Oncology Centre where he studied the effects of radium on cancerous growths at the beginning of World War I. ==Career==