Leads new Institutional Membership growth and strategic account expansion, owning pipeline development, sales, renewals, net revenue retention, cross-sell, and upsell. Serves as executive advisor to corporate and philanthropic leaders, oversees account servicing, coaches Member Success partners, shapes programming, facilitates executive convenings, and builds community. Requires an established senior impact-sector network, strong commercial judgment, executive presence, facilitation skills, and people-management experience.