Dickens had done an exceptional job growing the station's afternoon audience over the past 18 months, Winstanley said.
Today's announcement caps off a busy 18 months for New Zealand's number one talk station.
The evolution began with the introduction of The Devlin Radio Show and The Weekend Collective with Tim Wilson and Tim Roxborogh on Saturday and Sunday afternoons.
This was followed by the launch of Kerre McIvor Mornings and Heather du Plessis-Allan Drive following the departure of ZB legends, Leighton Smith and Larry Williams.
The Mike Hosking Breakfast weekday show was also extended from 8.30am to 9am.
Winstanley says it's been a privilege to reinforce the legacy network.
"Newstalk ZB is attracting more listeners than ever, it's such a big part of many New Zealanders lives, this continuing evolution of 'ZB' is a responsibility we take incredibly seriously.
"We've carefully ensured a strong structure and line-up is in place to meet the needs of our loyal audience and to attract new listeners in the years to come."