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London
I have spoken at DEF CON 30 (mainstage), various BSides (London, New York City, Rome, Prishtina, Dublin), and many other conferences such as HackCon Norway, Wild West Hackin' Fest @ Mile High, Nullcon Goa, Disobey Helsinki, SANS DFIR Summit and MITRE ATT&CK EU Community.You can find some recordings here: https://www.youtube.com/results?search_query=%22Wietze+Beukema%22
Head of Information Security
PT SIloam International Hospitals
Jakarta
Yuan Yudistira is the Head of Information Security at Siloam Hospitals Group, where he leads enterprise cybersecurity and digital risk strategy across 41 hospitals. He works closely with executive leadership to enable secure digital health transformation, secure cloud adoption, data protection, and operational resilience in large, complex healthcare environments.With over 12 years of experience spanning information security leadership, cloud architecture, and risk governance, Yuan has led initiatives aligned with NIST Cybersecurity Framework and ISO 27001 to strengthen cyber resilience, protect sensitive health data, and support scalable, cloud-first healthcare operations. He is a CISSP and CISM certified professional and a published book author on practical cybersecurity and risk management for organizations.
