Books

• Terrorist diversion: a guide to prevention and detection for NGOs. May, O and Curwell, P. Routledge, 2020
• Fighting fraud and corruption in the humanitarian and global development sector. May, O. Routledge, 2016

Papers and tools

• Study on Cash and Voucher Assistance (CVA) diversion risks. Charlot, C, May, O, Noun, B. Cash Learning Partnership, 2025 [coming soon]
• Counter-fraud investment cases leading practice guide, Australian Attorney-General’s Department, 2021
• Deloitte Australia and New Zealand bribery and corruption report 2020, Deloitte, March 2020
• Governance Toolkit, Australian Charities and Not-for-profits Commission (ACNC), 2020
• Improving the detection of corruption incidents in NGOs: Four lessons learned from South Asia, South Asia@LSE, June 2016

Articles

• We know more about fraud and abuse in aid. It’s time to stop it. The New Humanitarian, June 2020
• Taking stock: Four tips to prevent fraud and theft in our bushfire response, Pro Bono Australia (PBA), February 2020
• Culture wars: Do you really think you can change the culture of your not-for-profit? PBA, December 2019
• Giving fraud the finger: Are biometrics the final word in preventing aid diversion? PBA, July 2019
• Three good reasons to be grateful for whistleblowers, PBA, June 2019
• Is your non-profit suffering from regulatory fatigue? PBA, March 2019
• Financial Crime: The world’s most innovative industry, Deloitte, February 2019
• Five anti-bribery and corruption questions every NED should ask. NED Insider Edge, December 2017
• It’s time to talk about fraud in aid agencies. The Guardian, August 2016
• Detecting fraud in NFPs shouldn’t be a game of ‘moving statues’. PBA, August 2016
• Humanitarian need can enable corruption, FCPA Blog, April 2016
• Tackling the F-Word, Charity Finance Magazine, March 2016

Other

• Risk: it’s inevitable – so what do we do about it? Episode 3.5, Cashcast. CALP Network. November 2024
• Money matters! Funding for CVA. Episode 3.4, Cashcast. CALP Network. November 2024
• How do we make change happen? Episode 3.2, Cashcast. CALP Network. October 2024
• Time for change: Fiduciary and integrity risk in locally-led development, Australian AID conference. December 2023
• Giving cash directly – the future of aid? Business Daily, BBC World Service. August 2023
• Charity fraud awareness webinar, Australian Charities and Not-for-profit Commission, October 2021
• Oliver May on fraud and corruption in the aid sector, Episode 11, SocialEx podcast. Humentum. December, 2020
• Cash and voucher assistance and risk: Perception vs reality, CALP Network. July 2020