Lamar Senior High School opened it's doors in 1937, as the 7th HISD High School with 1345 students. The JROTC Program began that year as the 7th Battalion. LT John T. McDaniel was the first Senior Army Instructor, and a total of 120 cadets were enrolled that year. 1LT James H. Fields, a Lamar graduate, was awarded the Congressional Medal of Honor during World War 2. The school was named after Mirabeau Bonaparte Lamar, who was the 2nd President of the Republic of Texas and reputed to be the Father of Education in Texas.