Our Leadership Team

Michael Olver

Chief Executive Officer

Michael Olver comes to PSA from a well-known global specialist investigations company where he was previously a Director in the group’s Middle East and North Africa Disputes and Investigations practice. Michael has two decades of experience in complex multijurisdictional corporate investigations and due diligence and a lifetime of living and working across the Middle East, Asia and Africa. Now leading in the firms Washington DC office, Mr. Olver is responsible for overseeing US key Client relationships, and PSA’s group overall operations.

Mr. Olver has advised multinational companies, regional government entities, banks and high net worth individuals on the identification, structuring and mitigation of complex regulatory and operational risk abroad. Over the past two decades, he has led hundreds of investigations into complex matters in Saudi Arabia, the GCC, India, South Africa and Afghanistan and supported Clients in obtaining critical risk insight within the developing markets in Angola, Bangladesh, Nigeria, Thailand and Vietnam (amongst others).

Mr. Olver holds advanced degrees from the University of St Andrews, Scotland and the School of Oriental and African Studies, London. Michael speaks Arabic.


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Russell Worth

Chief Operating Officer l Managing Director, Greater China

Russell Worth has over 16 years’ experience in risk management and consulting in Asia. He has advised and managed multiple assignments in various jurisdictions. He specializes in conducting complex investigative assignments involving fraud or corruption, business intelligence and due diligence investigations, Pre-IPO investigations, asset searching, and other risk consulting services.

Prior to joining PSA, Mr.Worth was a managing director in a US listed Consulting firm based in Hong Kong. His engagements included a multi-jurisdictional fraud centered on the unauthorized use of trademarks; an extensive asset tracing assignment in support of a family dispute involving litigation; multiple pre-transactional business intelligence exercises; and a large fraud and compliance investigation on behalf of a major insurance company.

Mr. Worth served with the London Metropolitan Police Force between 1988 and 1998. During his police service, he acquired wide experience in operational police work and criminal legal practices. He has given evidence in court on numerous occasions and developed specialized skills in interviewing, handling of agents and victims of crime. Subsequent to leaving the police service, Mr. Worth worked for the Hong Kong International Airport Security Company where he gained experience in using technology to deter and prevent existing threats after the 911 terrorist attacks.

Mr. Worth holds a BA from Greenwich University


Sarah Wu


Sarah Wu is located in Shanghai and has over 10 years of work experience in Asia. Over the past eight years, she has managed a wide range of corporate fraud investigations and Pre-IPO and transactional due diligence projects. She has extensive knowledge of anti-corruption and AML legal and regulatory environments and enforcement trends. Sarah draws upon past experience in investigations, research, and analysis. Prior to joining PSA, Sarah worked at an investment firm and as a journalist.

Sarah holds an MA from Shanghai International Studies University. She is fluent in English and Mandarin and speaks Cantonese.  

Daniel Skeens


Daniel Skeens oversees and runs projects both in China and worldwide, including fraud investigations, asset tracing, and transactional due diligence. His area of focus is quality control – making sure PSA reports are written with clarity and that research is carried out with creativity.

Daniel also helped establish PSA’s third-party screening program, setting up internal processes and standards to ensure high standards and consistency.

Daniel studied International Relations at the University of Aberystwyth, graduating with first-class honors. He has lived and worked in China for over 10 years, and speaks fluent Mandarin.

Bill Xu


Bill Xu has been with PSA for more than 10 years, managing investigations into IP infringement and unfair competition, and due diligence into Pre-IPO and transactional projects. He has also set up comprehensive vendor screening programs for multinationals, run computer forensics, and advised companies on managing internal controls in China.

Xu received his BA in Law from Shanghai University of Finance and Economics.

Nathan Bunn

IT & Security Director

After graduating in the UK, Nathan has developed a strong technical background during almost 20 years of industry experience, along with a high level of spoken Mandarin and uses these skills to support PSA’s business operations throughout Asia and the world.


Matthew Sinkez


Matthew Sinkez is based in PSA’s Dubai office where he specializes in corporate investigations, due diligence, asset tracing, and risk assessments. He is responsible for the overall management and delivery of complex investigative assignments in emerging markets across the Middle East, Africa, and Asia. He has more than a decade of experience living and working in the region and has supported clients operating in the energy, telecom, banking, finance, insurance, and technology sectors.

An Arabic speaker, Matthew graduated from the Virginia Military Institute with a BA in International Studies and Political Science.


Crystal Avanceña

Associate Director

Crystal Avanceña heads the due diligence operations of PSA in Manila. She is responsible advising global clients with their various compliance requirements and supporting them with their due diligence needs. She has been with PSA since 2016. Prior to joining PSA, Crystal worked for the Office of the President of the Philippines for its national hosting of Asia Pacific Economic Cooperation (APEC).

Crystal holds an MA in Political Economy with specialization in International Relations and Development and a BA in humanities from the University of Asia and the Pacific.

Explore our

Due Diligence

PSA offers a broad range of due diligence services that are tailored to our clients’ needs and informed by regulatory requirements and relevant guidance.


PSA has conducted corporate investigations into issues of embezzlement, fraud, corruption and other misconduct in over 50 countries.


PSA provides strategic guidance to firms beyond routine due diligence, crisis-response investigation or market entry advisory services.

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