Grant Thornton UK has expanded its tax advisory team with a series of new senior appointments and internal promotions. 

The firm has added four new partners and three new directors. 

Antoinette Quinlan joins Grant Thornton as partner in its Innovation Tax team.  

Quinlan brings more than 20 years of experience in advising clients on research and development (R&D) tax incentives and government funding for innovation.  

She has worked with clients across various sectors, including life sciences, manufacturing, food and beverage, energy, and technology. 

At Grant Thornton UK, she will focus on helping large corporate and multinational businesses access R&D tax incentives.  

Quinlan will also assist clients in developing frameworks to manage risk and ensure eligibility for tax incentives. 

Chris Macdonald has been appointed as partner to lead the firm’s Private Capital Tax team in London.  

Macdonald, who began his career in corporate mergers and acquisitions tax, has spent the last eight years specialising in tax advice for private equity portfolio companies.  

In his new role, he will provide corporate tax advice to private and private equity-owned businesses in London and further grow the firm’s tax team in the capital. 

Jack Newton, who joined Grant Thornton in 2006 as a graduate, has been promoted to tax partner in the Milton Keynes office.  

Newton has more than 12 years of experience, specialising in tax due diligence and structuring services.  

As part of the national transaction tax team, he will focus on growing the firm’s regional team and strengthening relationships with mid-sized to large corporates. 

Colin Park, based in the Glasgow office, has also been promoted to partner.  

Specialising in tailored tax strategies for owner-managed businesses and large corporate groups across Scotland, Park advises on tax structuring for transactions, shareholder tax planning, and more. 

He will focus on expanding the Scottish tax practice and helping privately owned businesses across Scotland achieve their growth ambitions. 

Grant Thornton UK Tax head Hazel Platt said: “We’re committed to both attracting new talent to the firm but also recognising the brilliant talent we already have within the team and investing in their careers as we look to grow. Five senior internal promotions demonstrate our commitment to supporting the fulfilling careers that people can achieve at the firm as we have individuals now joining the partnership who first started their careers with us as trainees.   

“These significant investments in our tax team will strengthen our existing offering to clients and put us in a strong position for further growth, broadening the specialist support and advice that we can provide our varied and dynamic client base across the UK.”   

In addition, the new director promotions within the tax offering encompass Michelle Perry in Birmingham, Cristina Pavel in Glasgow, and Michael Cooper in Southampton. 

Earlier in January 2025, Grant Thornton also announced the appointment of 15 new partners across its audit, tax, and advisory services in Ireland.