Home » Leadership team strengthened with appointment of Andrew Mason as Partner

Leadership team strengthened with appointment of Andrew Mason as Partner


Warren Tilbury
Warren Tilbury Chief Executive Officer 5 December 2025

We delighted to announce the appointment of Andrew Mason as Partner in our Audit & Accounts team, further expanding our leadership and deepening our expertise in supporting the region’s dynamic and ambitious businesses.

Andrew Mason Partner PEM

With over 25 years’ experience in audit and assurance, Andrew joins us from RSM UK, where he was a Partner in the firm’s Cambridge office. He brings extensive technical knowledge and a proven track record of working alongside entrepreneurial private companies, mid-market venture capital and private equity backed businesses, and international groups across a diverse range of sectors.

Andrew is a Chartered Accountant and began his career with us as a trainee, qualifying in 1997. He has spent the majority of his career in the Cambridgeshire market, including senior positions with prominent national mid-tier firms. This has given Andrew a uniquely well-rounded perspective on the region’s business community and the challenges faced by growing, and well-established organisations.

His broad sector insight – advising clients in technology, life sciences, manufacturing, and consumer market sectors – combined with a pragmatic and commercially-driven approach, makes him a valuable addition to our growing leadership team.

“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, commented:
“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.”
Andrew’s appointment aligns with our continued investment in our team and focus on building long-term partnerships with businesses across Cambridge, East Anglia and beyond. Our emphasis on technical excellence and client trust remains central to our strategy as we continue to grow alongside the vibrant Cambridge business community.

As we continue to serve a broad range of clients across corporate, private and not-for-profit sectors, the addition of Andrew Mason underscores our commitment to attracting top talent and maintaining our position at the forefront of professional services in the East of England.

Latest news

About the author

With over 30 years of service to the firm, Warren joined PEM as an Audit Trainee in 1993 and, after qualifying, rose through the ranks to become our Managing Partner in 2016.

Warren Tilbury - PEM CEO

Get in touch

with us.

Please submit this form and our team
will be in touch.

If your enquiry is about careers/work experience opportunities, please contact recruitment@pem.co.uk.

Cambridge HQ

Salisbury House, Station Road,
Cambridge CB1 2LA


Cambridge North

Winship House, Winship Road, Milton,
Cambridge CB24 6AP

For general enquiries
Email: hello@pem.co.uk