CIBC Mellon Executive and Leadership Team

July, 2026

Leadership Overview

CIBC Mellon has 5 executives leading key functions including strategy, finance, technology, human resources, and operations.

Driven by a commitment to excellence, CIBC Mellon provides comprehensive investment servicing solutions to Canadian and international institutional investors, fostering trust and delivering value through robust financial expertise and operational integrity.

Leadership Roles at CIBC Mellon

  • Chief Executive Officer - Thomas MacMillan
  • Chief Financial Officer - John Riviere
  • Head of Technology Enterprise Security Chief Technology Officer & Chief Information Security Officer - Mike Plantinga
  • Chief Human Resources Officer - Maple Tam
  • Chief Operations Officer - Catherine Thrasher
  • Thomas MacMillan - Chief Executive Officer

    Thomas MacMillan, the Chief Executive Officer at CIBC Mellon, directs the overall strategic vision and operational framework for the company. MacMillan guides the organization's expansion into new markets and the enhancement of existing service offerings for Canadian and international institutional investors. Overseeing all major corporate initiatives, the Chief Executive Officer ensures alignment with the company's mission of providing superior investment servicing. This leadership position involves fostering a culture of innovation and accountability across all departments. By driving strategic partnerships and refining business processes, Thomas MacMillan directly impacts CIBC Mellon's market position and long-term financial health. Ultimately, MacMillan secures the company's commitment to integrity and client success in the competitive finance sector.

    John Riviere - Chief Financial Officer

    John Riviere, the Chief Financial Officer at CIBC Mellon, manages all financial operations and fiscal strategy for the firm. Riviere oversees budgeting, financial planning, risk management, and investor relations, ensuring robust financial health and compliance. Directing the finance department, the Chief Financial Officer provides critical insights into market trends and investment performance for Canadian and international institutional investors. This role involves optimizing capital allocation and driving profitability through disciplined financial oversight. By analyzing financial data and forecasting future performance, John Riviere directly supports strategic decision-making across the organization. Ultimately, Riviere safeguards CIBC Mellon's financial stability and enhances shareholder value through expert financial stewardship.
    John Riviere

    Mike Plantinga - Head of Technology Enterprise Security Chief Technology Officer & Chief Information Security Officer

    Mike Plantinga, the Head of Technology Enterprise Security Chief Technology Officer & Chief Information Security Officer at CIBC Mellon, architects the company's technological infrastructure and cybersecurity posture. Plantinga directs the development and implementation of advanced technology solutions and robust security protocols to protect client data and corporate assets. Leading the technology and security divisions, the Head of Technology Enterprise Security Chief Technology Officer & Chief Information Security Officer ensures operational resilience and compliance with industry regulations for Canadian and international institutional investors. This multifaceted role involves driving digital transformation initiatives and mitigating cyber threats. By enhancing system performance and fortifying security defenses, Mike Plantinga directly contributes to CIBC Mellon's reputation for reliability and trust. Ultimately, Plantinga champions technological innovation and data protection across the enterprise.
    Mike Plantinga

    Maple Tam - Chief Human Resources Officer

    Maple Tam, the Chief Human Resources Officer at CIBC Mellon, leads all human capital management strategies and initiatives. Tam oversees talent acquisition, employee development, compensation, benefits, and fostering a positive workplace culture to support the company's growth. Directing the HR function, the Chief Human Resources Officer ensures that CIBC Mellon attracts, retains, and develops a high-performing workforce capable of serving Canadian and international institutional investors effectively. This position involves cultivating an environment that promotes employee engagement and aligns with the company's core values. By implementing progressive HR policies and programs, Maple Tam directly enhances organizational effectiveness and employee satisfaction. Ultimately, Tam builds a strong talent pipeline essential for CIBC Mellon's sustained success.

    Catherine Thrasher - Chief Operations Officer

    Catherine Thrasher, the Chief Operations Officer at CIBC Mellon, oversees the company's day-to-day operational activities and service delivery. Thrasher manages the execution of core investment servicing functions, ensuring efficiency, accuracy, and compliance for Canadian and international institutional investors. Leading the operations division, the Chief Operations Officer drives process improvements and implements best practices to enhance client experience and operational scalability. This critical role involves optimizing workflows and managing resources to meet service level agreements. By streamlining operational processes and fostering cross-departmental collaboration, Catherine Thrasher directly contributes to CIBC Mellon's service excellence and market competitiveness. Ultimately, Thrasher ensures the seamless delivery of all client services and supports the company's strategic objectives.
    Catherine Thrasher

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    Frequently Asked Questions Regarding CIBC Mellon Top Executives and Leadership Team

    Who leads CIBC Mellon?
    CIBC Mellon is led by Thomas MacMillan (Chief Executive Officer), along with executives such as John Riviere (Chief Financial Officer) and Mike Plantinga (Head of Technology Enterprise Security Chief Technology Officer & Chief Information Security Officer).
    Who is part of CIBC Mellon’s executive team?
    The executive team of CIBC Mellon includes leaders such as Thomas MacMillan (Chief Executive Officer), John Riviere (Chief Financial Officer), Mike Plantinga (Head of Technology Enterprise Security Chief Technology Officer & Chief Information Security Officer) and other senior executives.
    How many executives does CIBC Mellon have?
    CIBC Mellon has 5 executives leading key business areas.
    What roles are included in CIBC Mellon’s leadership team?
    The leadership team of CIBC Mellon includes roles such as Chief Executive Officer, Chief Financial Officer, Head of Technology Enterprise Security Chief Technology Officer & Chief Information Security Officer, Chief Human Resources Officer, Chief Operations Officer.