Linden Homes site manager Steve Green will climb Kilimanjaro to raise money for The Children's Society.
Steve will trek up the 5,895m volcano in February this year with colleague Tom Amato, a financial director.
In April 2006, Steve ran the London Marathon for St Catherine's Hospice in Crawley.
Looking for a new challenge, he considered taking on both the London and the New York marathons in 2007.
Watching TV one evening he saw Extreme Dreams, with Ben Fogle taking a group of inexperienced mountaineers up Kilimanjaro.
"I turned round and said to my wife: 'I'm doing that,'" he recalled.
"She said: 'You're mad, that's for young and fit guys.'
"I said: 'No, I'm going to do it.'"
He decided to do the trek to raise sponsorship money for The Children's Society, and hopes to get at least £3,000.
The route his party will take passes through five different climate zones, with terrain ranging from rainforest to frozen scree.
The Children's Trust is a national charity providing specialist care, education and therapy for children with multiple disabilities and complicated health needs.
The money raised from the Kilimanjaro trek will go towards an appeal to build a new national rehabilitation centre for children who have suffered a brain injury either from an accident or a serious illness.
For more information, visit www.thechildrenstrust.org.uk
To sponsor the trekkers, go to www.justgiving.com/steve-n-tom
Full story in Friday's West Sussex County Times.