George Mercer, Jr., began his 35-year career in education in Seguin in 1955 coming to the district with one year of experience in the Butler ISD. He taught science at Ball High School for 11 years until his move to Seguin High School in 1966. There he served as a teacher and assistant principal until his retirement from full-time employment in 1990. Then, he began work as an assistant to the director of student attendance.

Mercer was born on Jan. 10, 1928, in Hearne, Texas. He received his bachelor of science degree from Prairie View A&M in 1950 and his master of science in biology, administration, and supervision in 1956. He held an elementary and secondary teaching certificate in all sciences as well as principal, administrative and superintendent certificates. He held professional membership in SEA, TSTA and NEA. He was a member of the Seguin Noon Lions Club, the Seguin NAACP and the American Association of Retired People. He served the community as commissioner of the Seguin Housing Authority. He was also a member of the Greater Second Baptist Church in Seguin where he was a deacon, pianist for the senior choir and financial secretary. In addition to his service to Seguin, Mercer served his country during the Korean War at which time he received the Purple Heart and the Combat Infantry Badge. He retired from the Army Reserve in 1976 as a lieutenant colonel. Mercer married Ethel Jones, and they had two children, Darrell and Sharita. George Mercer died on Oct. 22, 1992, at the age of 64. The Mercer-Blumberg Learning Center was named in his honor by the Seguin ISD Board of Trustees on April 12, 1994.