Bell works with properties that have been affected by crime, environmental contamination, construction defects and natural disaster. He has consulted on Nicole Brown Simpson's condominium; the Beverly Hills estate where Charles Manson's followers murdered Sharon Tate and four other people in 1969; the Rancho Santa Fe mansions where the bodies of 39 Heaven's Gate cult members were found, the house in Boulder, Colorado, where JonBenét Ramsey was killed; the home of Sandy Hook Elementary School shooter Adam Lanza; and the house of Las Vegas shooter Stephen Paddock. He has also consulted on Hurricane Katrina; the Bikini Atoll in the Marshall Islands; the September 11 attacks at the World Trade Center; and the United Airlines Flight 93 crash site in Shanksville. Bell has traveled to Chernobyl, Hiroshima; to the World Trade Center site; and to Egypt, Jordan, Israel and West Bank to find comparisons in properties damaged by terrorist attacks. He has also traveled to Antarctica to interview scientists about climate change and how it affects costs, such as insurance for home owners. The Appraisal Institute published Bell's book "Real Estate Damages: Applied Economics and Detrimental Conditions" in 2008. In 2011, Bell returned from Guam, where he consulted with landowners whose property included the cave where Shoichi Yokoi, a Japanese army sergeant, hid for 28 years, unaware that World War II had ended. The landowners opened a theme park on the property.