Kellaway joins the accountancy firm from PwC, where he spent 10 years as a senior manager, as part of the expansion of its employer solutions team.
In his new role, Kellaway will be responsible for driving growth of Smith and Williamson’s global mobility service offering, which includes the provision of tax advisory services.
On his appointment, Kellaway said: “I was very impressed with Smith and Williamson’s ambitious growth plans and long-term vision for the business and am pleased to be joining at this very exciting time.
“The employer solutions market, covering global mobility, employment tax and reward, is particularly buoyant and offers huge opportunities for growth.”
Tom Shave, head of London tax at Smith and Williamson, said: “Our employer solutions team has grown rapidly in the last 18 months, particularly as our clients respond to the changing world of work.
“Tom is our latest senior hire in the Employer Solutions team and brings with him a wealth of experience in the Global Mobility space.”
He added: “I’m delighted that he has chosen Smith and Williamson to pursue the next phase of his career and look forward to him advising our clients and driving further growth in the practice.”