
Financial services firm Grant Thornton Channel Islands has hired Mariane Nifas Dietrich as its new audit director within its audit practice.
The move forms part of the firm’s efforts to further boost its financial services capabilities.
Dietrich has 18 years of experience across multiple jurisdictions including the Channel Islands; Hong Kong, China; and the Philippines.
She has expertise in audit and assurance services for financial services clients, including fiduciaries, banks, and various entities in asset and wealth management.
Mariane said “I’m excited to join Grant Thornton, one of the Channel Islands’ leading independent assurance, tax, and advisory firms.
“I look forward to collaborating with clients, understanding their needs, and delivering tailored solutions to address their challenges.”

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By GlobalDataDietrich also has experience working with regulated entities in Jersey, and auditing UK-based companies and exchange-listed organisations.
Grant Thornton Channel Islands Partner and audit head Wynand Pretorius said: “We are delighted to welcome Mariane Nifas Dietrich as an Audit Director at Grant Thornton Channel Islands. We look forward to the additional value Mariane will bring to our team and our client proposition.”
Grant Thornton Channel Islands, part of Grant Thornton International, operates with more than 300 professionals across Guernsey and Jersey.
The firm offers a wide range of services, including accounting, outsourced accounting and payroll, recovery and reorganisation, private client services, audit and assurance, tax, regulatory consulting, and risk assurance.
In October 2024, US-based Grant Thornton Advisors and Grant Thornton Ireland agreed to combine their advisory and tax services.
Upon completion, the combined entity will offer a full suite of advisory and tax solutions.