Riley was the minister of Nazarene churches in
Livermore Falls, Maine,
New Haven, Connecticut,
South Portland, Maine, and
Toronto,
Ontario. He was minister of the College Church of the Nazarene in
Nampa, Idaho from 1944 to 1952, when he was elected as president of Northwest Nazarene College. While president of NNC from 1952 to 1973, Riley led an ambitious academic program to expand and professionalize the Christian liberal arts college. His Campus Plateau 1970 program added a number of new doctorates to the faculty, helped fund several new buildings, and clearly strengthened the college's reputation in the Pacific Northwest. Riley was particularly successful in encouraging Nazarenes of the Northwest to increase their financial support of the regional denominational college. He retired as president in 1973 and became a
missionary in
Africa,
Australia,
Israel, and
Switzerland for five years. He published
From Sagebrush to Ivy: The Story of NNC 1913-1988 in 1988 and died in 2001 at the age of 92. == Publications ==