He was a justice of the New York Supreme Court from 1929 until the end of 1942 when he reached the constitutional age limit. He was appointed official referee of the New York Supreme Court and served from January 7, 1943 until his death in Buffalo, New York.
- United States Congress. "Clarence MacGregor (id: M000009)". Biographical Directory of the United States Congress.
- Clarence MacGregor at Find a Grave
|New York Assembly|
John K. Patton
| New York State Assembly
Erie County, 8th District
|U.S. House of Representatives|
Charles B. Smith
| Member of the U.S. House of Representatives
from New York's 41st congressional district
Edmund F. Cooke
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