Eglinton was educated at Sale Grammar School and the where he was awarded Bachelor of Science, Doctor of Philosophy and Doctor of Science degrees.
Fellow, Ohio State University 1952. Lecturer in Organic Chemistry. University of Glasgow 1954-1964.
Visiting Fellow, University of California (Berkeley) 1964.
Senior Lecturer in Organic Chemistry, University of Glasgow 1964-1967, Reader 1967. Senior Lecturer in Organic Geochem. and Head, Organic Chemistry Unit, University of Bristol 1967, Reader in Organic Geochem.
1968-1973, Professor, and Head of Organic Geochem. Unit since 1973; National Aeronautics and Space Administration.
Married Pamela J. Coupland in 1955.