garrison was a senior executive with several companies including halliburton corporation and brown & root inc. at halliburton he worked for several years under former vice president dick cheney who was halliburton's ceo. garrison was directly responsible for many of halliburton's international operations in more than fifty-six countries with 4500 subordinates. he also, has over thirty-eight years of business experience primarily as a senior executive with fortune 100 companies such as usaa inc., in january 2008, dave retired as the executive vice president of corporate services for usaa inc. where he had responsibility for many aspects of corporate operations.