Born in Santurce, Puerto Rico, Pesquera was in the United States Army during World War II, from 1940 to 1946.
He returned to private practice in San Juan from 1953 to 1972, also serving as Chairman of the Puerto Rico Racing Board from 1971 to 1972.
[1] Pesquera was a Platoon Sergeant in the United States Army, and also attended the United States Army Officers Candidate School at Fort Benning, Georgia from May 1944 to February 1945, when he received his commission as a Second Lieutenant.
[citation needed] After his active service, he was a member of the United States Army Reserve from June 1946 until he retired as a Lieutenant Colonel in 1973.
The United States Army Reserve Center in Fort Allen, Puerto Rico is named after Pesquera.