On Board provides a contemporary guide to corporate governance and the responsibilities of directors in complex business environments. Jonathan F. Foster draws on experience in corporate boards, investment banking, and corporate litigation to examine board leadership, fiduciary duties, CEO-board relationships, regulatory compliance, risk oversight, mergers and acquisitions, restructurings, and shareholder engagement. The book also considers the growing influence of institutional investors and environmental, social, and governance concerns on board decision-making. Interviews, case studies, and examples from corporate practice illustrate how directors can respond to crises, evaluate strategic choices, strengthen oversight, and create long-term shareholder and stakeholder value. Written for directors, executives, governance professionals, business students, and aspiring board members, the work combines historical perspective with practical frameworks for improving board effectiveness and responsible corporate leadership