Our long-lasting relationships are built on a culture of trust, professionalism and dedication.
Collaboration characterizes our consulting approach. Our flexible framework allows for successful problem-solving, customized solutions, and the achievement of significant organizational goals. Learn more about our team below, and connect with us to see how GPA can transform your business.
the gpa team

Colleen Bastian
Ph.D.

Marcus Benayon
JD, MEd, PhD., C. Psych.

Sandra Bertoli
B.Sc.

Lara Patriquin
MD

Marc Prine
Ph.D.

Gerald Pulvermacher
Ph.D., C.Psych.

Stephen Scanlan
M.Ed.

Hartley Stern
MD, FRCS, FACS, ICD.D

Carey Stevens
Ph.D., C.Psych.

Debrah Wirtzfeld
MD MSc FRCSC ACC ICD.D MBA

Jennifer Signe Card
Jennifer holds a doctorate in Organizational Leadership Psychology (Psy.D.) and a MSc. degree in Applied Positive Psychology and Coaching Psychology (MAPPCP).
Jennifer is a seasoned leadership consultant, organization development (OD) practitioner, team facilitator and an executive coach, predominantly providing services to the C-Suite and Executive Level. Jennifer is a member of the International Coaching Federation (ICF) and the Institute of Coaches (IOC). In addition, she has a certificate in Cognitive Behavior Therapy from the Beck Institute.
Jennifer’s coaching and consulting services tend to focus on helping organizations to conduct difficult conversations & improve communication, tighten teamwork, optimize leadership skills; onboard new teams/roles, and navigate transition & uncertainty. As a former fitness instructor, she also enjoys helping clients to create sustainable wellbeing programs and practice more work/life balance.
Jennifer resides in Bermuda and has engagements in the Caribbean, Canada and the UK.

Nicholas Tiliacos
Nicholas Tiliacos is a career Chief Executive Officer with a proven track record of driving consistent double-digit growth in public and private companies. He has wide-ranging international operational, fundraising, and M&A experience, giving him a unique ability to advise and coach domestic and global clients. Currently, he is focused primarily on engagements in Europe and North America.
He has led companies at different stages of development, from being the CEO of a NASDAQ publicly-traded company to leading early-stage startups. He has learned that changing business circumstances require diverse human talent, approaches, and tactics. What is common to all phases of business is the need to maximize individual performance, promote risktaking and innovation while preserving the necessary teamwork to achieve common organizational goals.
Nicholas holds a BS in Business Administration, a master’s degree in International Management (M.I.M) from the Thunderbird School of Global Management and is a certified Executive Coach.

Marcus Benayon
Marcus has consulted with Canada’s top family offices and industry leaders as their personal advisor and chief of staff. He subsequently grew advisory practice partnering with high-net-worth families across Canada, Europe, and the US in dealing with wealth transfer, business development and legacy.
Marcus has also served as Executive Advisor to six CEOs and Presidents of major private and public companies across diverse sectors, including land development, finance, and manufacturing. Although his roles have been diverse, all required the ability to influence, build trust and develop strategic relationships with key stakeholders, including C-Suite, Boards and Government Officials. Marcus has also had the opportunity to coach and mentor new and existing leaders to help advance their most critical objectives.
At his core, Marcus is a teacher and educator. Culturally astute, Marcus’ perspective is global and multicultural having lived, worked and traveled across the USA, Canada, Israel, Europe, building relationships and a diverse professional network.
Dr. Marcus Benayon, holds a Doctorate degree in Applied Psychology and Human Development, a Master’s degree in Education, both from the University of Toronto, and Juries Doctor from Columbia University, NYC.
Marcus lives in New York City.
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