As a historian and journalist from 1970 to 1985, he has written articles for the New York Times, Society of Architectural Historians, Smithsonian, and other publications, ranging from architecture and real estate to urban history. During these 15 years, he wrote six books on U.S. architecture and cities. In 1973, he received a Guggenheim Fellowship.

Lockwood became a real estate consultant in 1985. He provided consulting services to architectural firms, real estate companies, and professional services firms. During this period until 2003, he continued to publish articles on architecture and real estate, for major publications including the New York Times and the Wall Street Journal. He co-authored (with Christopher B. Leinberger) two cover stories for the Atlantic Monthly: "How Business is Reshaping America" - which identified the emergence of “urban villages”, also known as “edge cities"-- mixed-use suburban developments, and "Los Angeles Comes of Age" in 1988, which he discussed Los Angeles’ emergence as a major world city.

Since 2003, Lockwood has advised clients on corporate sustainability issues, and was a regular keynote speaker. His article “Building the Green Way” was published in the June 2006 Harvard Business Review.

• This book consists of Lockwood's conversations with U.S. and international thinkers about sustainability for the business world and the built environment. Some are experts like three-time Pulitzer-winner Thomas L. Friedman.

• An architectural and social history. First published by McGraw-Hill in 1972.