Warwick was previously strategy director for the equity release company.
He has spent 25 years working at Prudential and was the managing director of Primetime Retirement.
As group B2B distribution director, he will focus on building and promoting relationships with business partners on behalf of all group brands, including Key Partnerships, More 2 Life and AIR Group.
Having recently rebranded, Key Group said it was keen to develop and strengthen its B2B relationships.
Warwick said: “With new funders, intermediaries and distributers looking to access this constantly evolving market, I am delighted to step into the role.
“It is a very exciting time for the business and my focus will be on managing and evolving the relationships we have with our business partners on behalf of all group brands.”
Simon Thompson, chief executive at Key Group, said: “As a group, not only are we focused on working with the industry to develop the later life lending market but we are also keen on collaborating with partners to build smart later life lending products.
“To achieve this goal, we need to actively consider how we manage, deepen and develop our relationships with our B2B partners and Russell’s appointment will help us to meet the needs of this important audience.”