Before becoming active in civilian government service, he worked as a lawyer in Denver, Colorado, specializing in real estate, municipal finance and zoning law. In 1978 he founded Nicholson Enterprises, Inc., a developer of planned residential communities, and in 1987 he bought Renaissance Homes, a custom-house builder. He now works in the Washington, D.C. office of Brownstein Hyatt Farber & Schreck LLP.