He was a Colonel in the United States Army during the Spanish–American War.

[2] Kennamer was nominated by President Calvin Coolidge on January 28, 1924, to the United States District Court for the Eastern District of Oklahoma, to a new seat authorized by 42 Stat.

He was confirmed by the United States Senate on February 19, 1924, and received his commission the same day.

Kennamer was reassigned by operation of law to the United States District Court for the Northern District of Oklahoma on February 16, 1925, to a new seat authorized by 43 Stat.

He assumed senior status due to a certified disability on June 1, 1940.