TisaMayo International Consultancy
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    • Timo der Weduwen
    • Robert Goris
    • Calvin Chrustie
    • Cathy Macdonald
    • Lynne Bethke, PhD
    • Ludo Block, PhD
    • Bob Young
    • Brendon Largue
    • Laura Domínguez González
    • Fedor Keredzin
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    • Home
    • About
    • Services
    • Unique Products
    • Clients
    • Team
      • The Team
      • Timo der Weduwen
      • Robert Goris
      • Calvin Chrustie
      • Cathy Macdonald
      • Lynne Bethke, PhD
      • Ludo Block, PhD
      • Bob Young
      • Brendon Largue
      • Laura Domínguez González
      • Fedor Keredzin
    • Contact

TisaMayo International Consultancy

  • Home
  • About
  • Services
  • Unique Products
  • Clients
  • Contact
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Calvin Chrustie

Senior Partner

InterVentis Global


Calvin is a strategic investigative consultant.  He has successfully advised and coached executives, diplomats, politicians and community leaders for several decades.  He specializes in negotiations (ransom), intelligence, investigations, crisis response and management.  A senior partner with InterVentis Global (www.interventisglobal.com), he engages with the ‘human element’ in high-risk operations, with a special interest and passion in cybersecurity.  Specifically, cyber-extortion, ransomware, insider threats, government liaison, ransom negotiations, ransom payments, crisis management and cyber incident response.


Calvin is a graduate of the FBI Academy’s and Scotland Yard's international hostage negotiation programs. He holds a Masters in Law (LLM), specializing in Alternate Dispute Resolution - Conflict and Negotiations.  He also holds a BA in Justice and Law Enforcement and a BA (honours) with a Major in Law.