Long Island’s dominant residential real estate brokerages help solidify racial segregation. Realtors frequently directed white customers toward white areas, while directing minority buyers toward more integrated neighborhoods. They also avoided doing any business in communities with large minority populations. Although not a college graduate, Dedman taught advanced reporting as an adjunct lecturer at Boston University, Northwestern University, the University of Maryland, and Stony Brook University, and served for six years on the board of directors of the association Investigative Reporters and Editors. Dedman's investigative reporting is analyzed at length in two books: Custodians of Conscience, which examines the techniques and moral implications of investigative reporting, and the textbook The Ethical Journalist: Making Responsible Decisions in the Digital Age.. In addition to serious investigative reporting, Dedman has done quirky stories, including his account in The Washington Post of discovering the 1989 DC Prostitute Expulsion, when police officers attempted to force sex workers to march down 14th Street, past the Washington Monument and across the 14th Street Bridge toward Virginia. Empty Mansions and Huguette Clark While working for NBC News as an investigative reporter, Dedman uncovered the case of the reclusive copper heiress Huguette Clark. He documented her life in a series of reports on NBCNews.com and The Today Show in 2010-2012. Dedman reported the Clark mystery first in an online slideshow, a series of 47 photos with 2,788 accompanying words in captions. The slideshow attracted more than 75 million page views, more than any story in the website's history. Dedman and Clark's cousin, Paul Clark Newell, Jr. (1936–2016), co-wrote the 2013 nonfiction book Empty Mansions about Clark and her father, the Gilded Age industrialist William A. Clark. Published September 10, 2013, by Ballantine Books, Empty Mansions debuted at No. 4 on The New York Times Best Seller list for hardcover nonfiction, and was the No. 1 bestselling nonfiction e-book in America. Empty Mansions has been published in translation in China, Brazil, and Italy, and in English in the U.S., Canada, the United Kingdom, and Commonwealth countries. The film rights to Empty Mansions were optioned by Fremantle, which is developing a TV series with HBO, director Joe Wright, and screenwriter Ido Fluk. The book was optioned earlier by film and television director Ryan Murphy. Awards Dedman has received the Pulitzer Prize for Investigative Reporting, the Worth Bingham Prize for national investigative reporting, the Robert F. Kennedy Journalism Award grand prize, the Society