He attended Limestone High School, graduating in 1949, then matriculated at the College of the Holy Cross.

On August 11, 1981, President Ronald Reagan nominated Cyr to the United States District Court for the District of Maine vacated by George J. Mitchell, who had resigned following his appointment as a United States Senator.

[4] On August 4, 1989, President George H. W. Bush nominated Cyr to serve on the First Circuit, in the seat vacated when Frank M. Coffin assumed senior status.

Cyr assumed senior status on January 31, 1997 and continued to hear cases for several years afterwards.

His dedication to justice and to his country has left an indelible mark on the legal system and on this nation".