As the president of the CBS Television Digital Media Group since 2004, Mr. Leess led the group's efforts to develop online video and digital newscasts with the goal of breaking news on the Web and turning the Internet into a meaningful advertising medium for TV stations.
During those four years, the group has grown from less than 2 million monthly unique visitors watching fewer than 1 million video streams per month to more than 15 million unique visitors watching more than 25 million streams of video per month.
"My work here is done," Mr. Leess said when reached by TelevisionWeek. "I have done everything I needed to from building from scratch to positioning CBS down the digital road. They are competitively positioned for exponential growth and that's what I was hired to do."
It was not immediately clear if CBS plans to name a replacement.
Mr. Leess said he doesn't have immediate plans after his tenure ends but expects to continue working in digital media.