Mark Tantam is the Global Head of Forensic with Teneo’s Financial Advisory business, based in London. Mark joined Teneo in December 2022 with the challenge of building the forensic team across the world.

A criminal lawyer by background, Mark has spent 30 years working with the largest banks and leading global companies and charities to manage the consequences of regulatory failure, financial crime, breaches of sanction, corruption and fraud. Between 2011 and 2018, he led the Forensic team for a big 4 firm in the UK, doubling the size of the team and leading a number of high profile assignments.

Prior to joining Teneo, Mark was Managing Partner (UK) at the international law firm, Ince, where he developed the consulting business and introduced various measures across the UK partnership designed to improve business performance, increase cashflow, and successfully integrate the two partnerships following the acquisition of the legacy Ince business in 2020.

From 1990 until his retirement from the partnership in 2019, Mark worked in Forensic at Deloitte in the UK.  He made partner in 1997, global head of investigations in 2003, head of Forensic in 2007 and a vice chair of the firm in 2014.  During that time, he has led projects for all the big 4 UK banks, most of the leading European banks and branches of other foreign banks, several large global companies and many large charities.

His deep expertise covers financial crime (including sanctions), fraud, corruption, and false accounting.  His work often takes the form of an independent review with interested parties potentially including a regulator such as the UK Financial Conduct Authority or a law enforcement agency such as the US Department of Justice.

Mark started his career in private practice as a barrister and then joined the UK Serious Fraud Office as a prosecutor.

He holds an MA in Jurisprudence from Oxford.