Hussain provides the role with experience across the private client tax sector, specialising in international families with complex overseas structures.
He also brings a background of advising private equity executives on their fund interests to the position.
Tom Shave, partner and head of London tax at the company, said: “I am delighted that Majid is joining Smith and Williamson as a partner to help drive continued growth in our private client tax practice.
“Majid’s appointment is one of a number of significant hires we are making as we accelerate our growth plans.”
He said: “I am pleased to be joining Smith and Williamson at this very exciting time. The private client market is especially buoyant and offers huge opportunities for growth.
“Clients are looking for advisers who can provide them with bespoke, holistic advice on all matters concerning private wealth.”
Hussain added that he is looking forward to supporting the growth of the group that is “perfectly placed to assist high-net-worth clients”.