Admitted to practice in Maryland, the District of Columbia, U.S. District Court (Districts of Maryland and Columbia), U.S. Tax Court, U.S. Court of Federal Claims, U.S. Court of Appeals (4th Circuit and D.C. Circuit), U.S. Supreme Court.
Professor DeJong is a nationally recognized tax authority and speaks to various industry groups throughout the country. He is Chair of Stein Sperling's Tax Practice group. Co-author of J.K. Lasser’s book, Year Round Tax Strategies, for 16 years, he has been frequently quoted in a number of publications, including the Wall Street Journal and the New York Times. He has also testified as an expert witness over 40 times in tax, estate and business valuation matters.
Professor DeJong is active in many professional groups. Among them are the American Association of Attorney-Certified Public Accountants, where he formerly served as National President and received the Louis S. Goldberg Memorial Award for lifetime service to the organization, and the Montgomery County Bar Association and Foundation, which recognized him as an Honorary Life Bar Leader for his many years of committed service.
He has been an adjunct professor for over 25 years.