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Born in Muskogee, Oklahoma, Harold MacDowell graduated from high school in Fort Smith, Arkansas and received his Bachelor's degree in Engineering Management from Southern Methodist University (SMU) in 1984. He entered the construction industry as an estimator through SMU's School of Engineering Cooperative Education Program and later became a Project Manager for Wallace Mechanical Corporation. Harold is now the CEO of TDIndustries, which was ranked 35 in FORTUNE 's 100 Best Companies to Work For 2008.
MacDowell currently serves as a member of the Dallas Citizen’s Council, the Board of the Greater Dallas Chamber, the Board of Trustees for the Parish Episcopal School, and the QUOIN-AGC Board. He is a Past Chairman of the Board for the Construction Education Foundation that provides educational opportunities to construction craftspeople who want to be masters of their trades. MacDowell also is a member of the SMU School of Engineering Executive Advisory Board. He is involved in Habitat for Humanity.