Leonis has delivered lectures or has been invited, as a speaker, at various forums, including:

• UAE Central Bank Abu Dhabi
• University College of London (Mumbai): Panel discussion on Cyber Crime against Senior Citizens
• Confederation of Indian Industries.
• Indian Banks Association’s Banking Secure meet. He was a member of the panel. The topic was “Cyber Crime – A Growing Issue”.
• British High Commission, Mumbai
• Co-Chair by Institute of Forensic Sciences & TATA Institute of Social Sciences
• LNJN National Institute of Criminology and Forensics Sciences Institute, New Delhi (Delivered lecture for members of Judiciary, Prosecution Lawyers, Police officers)
• North Eastern Police Academy, Meghalaya.
• Police Cyber Cells in Mumbai, Navi Mumbai, Thane & Institute of Forensic Sciences.
• Comptroller and Audit General - Regional Training Institute
• Raj Bhavan Mumbai
• British High Commission- Mumbai
• CA Institute - Western Region.
• Elite member of the Kerala Police Cyber Security project @ CYBER DOME.