About Tosca Van Vijfeijken
With over 30 years of experience, Tosca Bruno-van Vijfeijken is a trusted consultant, speaker, team coach, facilitator, and author serving both international and US-based nonprofits and philanthropic organizations. Her expertise spans leadership development, governance, team coaching, change management, and organizational culture and health, helping mission-driven organizations navigate complexity, strengthen leadership capacity, and improve organizational effectiveness...
…Tosca’s career began in the international development sector, working with institutions such as the World Bank, United Nations, global think tanks, and both Global North and Global South-founded nonprofits. In recent years, her focus has expanded to include US-based nonprofit organizations and philanthropy networks, supporting leaders and teams in strategic adaptation, organizational culture transformation, and navigating change.
Tosca is co-author of the acclaimed book “Between Power and Irrelevance: The Future of Transnational NGOs,” a forward-looking analysis of how international NGOs must evolve to remain impactful in today’s changing global landscape. She is also the creator and host of the NGO Soul+Strategy Podcast, where she interviews nonprofit and philanthropy leaders about leadership challenges, organizational culture, and the future of the sector.
As a Core Practitioner at Corentus, a globally recognized team coaching firm, Tosca helps leadership teams build trust, alignment, and performance through structured team coaching programs rooted in research and tailored to the nonprofit and philanthropy sectors.
Tosca is the founder of Five Oaks Consulting, her independent consulting practice. The name, a translation of her Dutch last name, reflects her personal touch and deep commitment to authentic leadership, cultural agility, and meaningful organizational transformation.
A dual citizen of the United States and the Netherlands, Tosca has lived in Upstate New York for more than 20 years with her family. Her global perspective, combined with her deep understanding of nonprofit leadership challenges, makes her a sought-after advisor, speaker, and leadership coach for mission-driven organizations worldwide.
