Business consulting for owner of privately held, lower middle-market companies. Specialize in the sale of companies with revenue b/w $2-$65 million. Value Builder System, EOS Implementation and Business Valuation. Dr. Nolan Duck is founder of DBG Advisors. He began his career in mergers and acquisitions in 2006 and in his first year, he listed and sold a company for $5.75 million dollar within four months. Most importantly, he continues to help business owners identify sales opportunities and to guide them through the process of selling their business.