PEM, the Cambridge-based accountancy, tax and business advisory firm, has appointed Andrew Mason as a partner in its audit and accounts team. Mason joins PEM after serving as a partner at RSM UK’s Cambridge office and brings over 25 years of experience in audit and assurance.
Throughout his career, Mason has advised private companies, mid-market venture capital firms, private equity-backed businesses and international groups. He regularly works with clients in the technology, life sciences, manufacturing and consumer markets.
Mason began his career at PEM as a trainee, qualifying in 1997, and has spent most of his professional life in the Cambridgeshire market. His return to the firm marks a homecoming to a company with which he has a long-standing connection.
He said: “I’m delighted to be joining PEM – a firm with such a strong reputation for its people, culture and commitment to Cambridge’s business community.
“The city continues to attract exceptional talent and innovation, and PEM sits at the heart of that ecosystem.
“I look forward to helping clients capitalise on the opportunities this presents and supporting PEM’s ongoing growth strategy.”
Warren Tilbury, managing partner at PEM, added: “We’re delighted to welcome Andrew to PEM.
“His depth of technical knowledge, long-standing connections in the Cambridge market, and experience advising fast-growing and complex businesses will strengthen our team and enhance the support we offer clients navigating an increasingly challenging environment.”
The appointment highlights PEM’s focus on reinforcing its advisory capabilities and deepening its expertise in audit services, particularly for complex and growth-focused businesses in Cambridge and beyond.

