NEW YORK — Anderson Cooper signed off from the long-running newsmagazine program on Sunday after two decades as a correspondent. His final report examined the clash between technology and the taxi industry, describing how London cab drivers resisted displacement by technology companies.

Cooper joined the program in the 2006-07 season through an arrangement between CBS News and CNN. His first report aired in December 2006 and focused on Joe Darby's disclosure of U.S. soldiers abusing Iraqi prisoners at Abu Ghraib prison.

Cooper, who has two children ages 4 and 6, expressed a desire to spend more time with them. "It's been really challenging to do the kind of work you need to do to have a great piece on. CNN doesn't like it if I take a lot of time off to work on a piece, so I've worked mostly on weekends," Cooper said.

Reflecting on the program as he departed, Cooper spoke about its longevity and standards. "There's very few things that have been around for as long as it has and have been able to maintain the quality that it has," he said.

Cooper also addressed the program's editorial approach. "I think the independence has been critical," he said. "I think the trust it has with viewers is critical to the success of the program," he added.

Cooper said he hoped the program would retain its character through any future changes. "Things can always evolve and change, and I think that's awesome, and things should evolve and change, but I hope the core of what it is always remains," he said. "I hope it remains what it is," he also said.

A CBS News spokesperson addressed Cooper's departure in a statement. "We're grateful to him for dedicating so much of his life to this broadcast, and understand the importance of spending more time with family. The program will be here if he ever wants to return," the spokesperson said.

In a separate video segment, Cooper described recording his on-camera introductions as "weird" and said veteran correspondent Mike Wallace made fun of him for his first attempts. Cooper joined the program in the 2006-07 season, with his debut report focusing on Joe Darby's role in exposing the Abu Ghraib prisoner abuse scandal.