About Ralph Jeffery Ralph L. Jeffery (1889-1975) was the head of the Mathematics Department at Queen's University for 18 years until his retirement in 1960. Books by Ralph Jeffery Trigonometric Series A Survey by (author) Ralph Jeffery The Theory of Functions of a Real Variable (Second Edition) by (author) Ralph Jeffery Calculus (Third Edition) by (author) Ralph Jeffery The Theory of Functions of a Real Variable (Second Edition) by (author) Ralph Jeffery Calculus (Third Edition) by (author) Ralph Jeffery Trigonometric Series A Survey by (author) Ralph Jeffery