Inspired by the Japanese principle of “kokorozashi” (志): a sincere dedication to create enthusiasm in others through meaningful and impactful leadership.

Mathias Colleau

EY Luxembourg Audit Services Partner

Lead Partner for Japanese Business Services at EY Luxembourg

Mathias led complex audit engagements for multinational commercial groups (listed and non-listed), primarily under ISA and PCAOB standards, with a strong emphasis on consolidation and IFRS.

He spent three years in Tokyo, where he supported well-known listed clients through post-merger integrations, carve-outs, and accounting change projects, developing a versatile skill set that spans both audit and advisory.

Mathias holds an MBA from Keio University in Tokyo and a master’s degree in finance from NEOMA Business School in Paris, and is a Chartered Accountant (“Réviseur d’Entreprises Agréé”).

How Mathias is shaping the future with confidence

Mathias is guided by several principles he embraced during his time in Japan, which continue to shape his decisions and actions in service to society. He is committed to delivering an exceptional client experience by proactively understanding client needs, fostering open and harmonious communication and ensuring consistent quality through timely execution and pragmatic solutions.

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