Henderson and Denney, copywriter and art director respectively, have been behind some of RKCR/Y&R's most high-profile work. Their credits include "jet" and "hotel", which feature the rapper Busta Rhymes, for Virgin Mobile's "idle thumbs" campaign, and the "animalistic" spot for Land Rover.
Their "gourd" spot for the Land Rover Freelander, which featured a man mistaking an African codpiece for a trumpet, was one of the highlights of the "been anywhere interesting lately?" campaign in 2002.
The pair, who will start work at Saatchis in March, have also picked up a Cannes gold for their work for St Mungo's, the charity for the homeless.
"Saatchis is a very creatively led agency, one of the few that makes creative an integral part of its business offering," Henderson said. "Tony Granger (the executive creative director) is very focused and driven and we decided that we wanted to be part of the agency's mission."
Henderson and Denney became a creative team and were appointed to the board following the merger of RKCR/Y&R in 1998. Henderson began his career with the agency in 1994, having worked at Grey and DDB. Denney joined Y&R in 1996.