He was in private practice in Cheyenne, Wyoming Territory from 1879 to 1884.
[1] Riner was nominated by President Benjamin Harrison on September 20, 1890, to the United States District Court for the District of Wyoming, to a new seat authorized by 26 Stat.
He was confirmed by the United States Senate on September 22, 1890, and received his commission the same day.
He was the last district judge who continued to serve in active service appointed by President Harrison.
His service terminated on March 4, 1923, due to his death in Cheyenne.