Dave Siegwald graduated from Loyola University (New Orleans) in 1965 and joined the Marine Corps in early 1966. He graduated from OCS and was commissioned as a 2nd Lt. in June 1966. After an additional year of training, he volunteered to serve in Viet Nam. In June 1967 he was deployed there. He was a Combat Engineer Officer and served with B Co, 9thEngineer Bn, 1st Marine Division. He was a platoon leader, the company executive officer and the company commander during his tour. Upon returning to the U.S. he was stationed at MCRD Parris Island where he trained recruits until September 1969, when he returned to civilian life. He married Jolley in 1970 and they lived in New Orleans until they moved to Tampa in 1972.
After having various jobs, he joined the Treasury Department as a Special Agent with the IRS Intelligence (Criminal) Division in 1974. He worked as a Special Agent (criminal investigator) in Tampa and then Sarasota, until his retirement in mid 1994. A month later, he opened a private investigative agency and specialized in white collar crime investigations. In 2000 he was re-hired by the Treasury Department as an instructor at the Federal Law Enforcement Training Center in Glynco, Georgia, where he trained new agents in various aspects of criminal investigation. In 2002 he joined Chase and Associates, a private investigative agency, based in Tampa, and worked at Chase until he retired again in 2017.
In 2008 he and Jolley began volunteering annually at a home (el Hogar San Francisco de Asis) for sick and destitute kids, in Chaclacayo, Peru. The home is funded by Villa La Paz Foundation, Inc., which is a Florida non-profit corporation.