Rescorla left teaching for higher-paying jobs in corporate security, joining Dean Witter Reynolds at their offices at the World Trade Center in New York City in 1985, and living in New Jersey. After the 1988 bombing of Pan Am FLIGHT 103 over Lockerbie, Scotland, Rescorla worried about a terrorist attack on the World Trade Center. Because his old American friend from Rhodesia, Daniel Hill, was trained in counterterrorism, in 1990 Rescorla asked him to visit the World Trade Center to assess its security. When Rescorla asked Hill how he would attack the building were he a terrorist, Hill asked to see the basement, and after the two walked down to the basement parking garage without being stopped by any visible security, Hill pointed to an easily accessible load-bearing column, and said, "This is a soft touch. I’d drive a truck full of explosives in here, walk out, and light it off." That year, Rescorla and Hill wrote a report to the Port Authority of New York and New Jersey, which owns the site, insisting on the need for more security in the parking garage. Their recommendations, which would have been expensive to implement, were ignored, according to James B. Stewart's biography of Rescorla, Heart of a Soldier.