HaysMac, the award-winning accountancy, tax and advisory firm, today announces the appointment of Gary De Souza as Director in its Media, Marketing & Advertising (MM&A) sector team.
Gary joins from Moore Kingston Smith, where he spent over a decade advising media, marketing and creative businesses across the UK. Working within a specialist media team since 2016, he has supported a broad range of clients, from entrepreneurial start-ups through to established and international groups, delivering compliance services alongside commercially focused advice. This includes supporting businesses with financial planning and strategic decision-making, such as valuations, cash flow forecasting and group reorganisations; helping them to scale sustainably and navigate increasing complexity.
His experience spans the creative industries, including independent agencies, production houses and growing media businesses, providing practical, insight-led advice tailored to each stage of the business lifecycle. He has also supported numerous international creative businesses establishing operations in the UK.
At HaysMac, Gary will play a key role in expanding the MM&A team, deepening client relationships, driving new business growth, and enhancing the firm’s offering to creative businesses in a rapidly evolving landscape.
HaysMac’s MM&A team is recognised for its deep sector expertise and long-standing client relationships, supporting organisations across the creative industries with a commercially driven, forward-thinking approach at every stage of their journey.
Speaking of his appointment, Gary, Director at HaysMac, said: “I’m excited to be joining HaysMac at such a dynamic point in its journey. The firm has built a strong reputation in the media, marketing and advertising space, underpinned by deep sector expertise and a people-first culture.
There is a clear sense of momentum and ambition across the firm, and I’m looking forward to building on this — working closely with clients to provide practical, commercially focused advice as they navigate growth and complexity in an increasingly fast-moving sector.”
Jon Dawson, Partner and Head of Markets and Sectors, added: “As the sector landscape continues to evolve, our focus remains on helping clients realise their potential, whether that’s scaling for growth, navigating complexity or responding to emerging opportunities. Gary’s experience and mindset align closely with that ambition, and I am confident he will make a significant contribution to both the MM&A team and the wider firm.”
Natasha Frangos, Managing Partner at HaysMac, commented: “We are delighted to welcome Gary to HaysMac. He brings a strong track record in the media, marketing and advertising sector, alongside a clear passion for supporting ambitious, entrepreneurial businesses.
Gary’s appointment forms part of our ongoing strategy to invest in high-calibre talent, enhancing the breadth and depth of technical expertise across the firm. These strategic hires are key to strengthening our sector and market-led approach and ensuring we continue to deliver high-quality, insight-driven advice to our clients.”
This announcement follows an exceptional 12 months for HaysMac. Most recently, the firm was recognised for the third consecutive year as one of The Sunday Times ‘Best Places to Work 2026 – Big Organisation’ and named ‘DEI Champion of the Year’ at the Lloyds British Business Excellence Awards,. These achievements build on HaysMac’s inclusion in eprivateclient’s ‘Top Accountancy Firms’ for 2025, ranking the leading UK tax advisory firms serving domestic and international private clients, their businesses, and families.
In January 2026, HaysMac celebrated its 25th anniversary, marking a quarter century of delivering exceptional service, fostering talent, and making a lasting impact across the business and social purpose community. This milestone year also saw the strategic acquisition of corporate finance firm Green Square, further strengthening HaysMac’s deal advisory capabilities. Alongside this, the firm acquired Moore DM’s US Tax team, enhancing its international tax compliance offering and Private Client Tax expertise to provide seamless cross-border support.
