At Edinburgh University Cassels studied Ordinary Mathematics, Natural Philosophy, and Chemistry in session 1910-11; Ordinary Logic, Intermediate Honours Mathematics and Experimental Physics in 1911-12; Intermediate Honours Mathematics, and Natural Philosophy (Dynamics and Thermodynamics), Advanced Mathematics, and Experimental Physics in session 1912-13; Honours Advanced Mathematics, Function Theory, Electrostatics, Dynamics (Advanced), and Experimental Physics (Advanced) in session 1913-14. He was awarded an M.A. with Second Class Honours in Mathematics and a B.Sc. (Pure) in 1914.
Cassels became a school teacher, teaching mathematics at The Academy, Ayr. He joined the Edinburgh Mathematical Society in January 1927.
Article by: J J O'Connor and E F Robertson