Holt is the great-grandson of
Benjamin Holt, who developed the first practical track-type tractor in 1904. His family's history in
San Antonio, Texas began in 1933, when his great-uncle, William K. Holt, moved to San Antonio to start a
Caterpillar dealership. As he had no heirs, Bill invited B.D. Holt (Peter's father) to get involved in the business. In 1961, B.D. Holt moved to
Corpus Christi, Texas and started his own Caterpillar dealership. Holt was born in
Peoria, Illinois. He lived in San Antonio as a child before moving to Corpus Christi. After graduating high school in Corpus Christi, Holt went into the
United States Army, serving two years, including a one-year tour of duty as an infantryman in
Vietnam. He ended his military duty as a sergeant with a
Silver Star, three
Bronze Stars, and a
Purple Heart. ==Early business career==