Inadequate racial and ethnic diversity on nonprofit boards is a perennial problem. Although nonprofit boards consistently identify improving racial and ethnic diversity as an imperative, they significantly underperform in their representativeness. Researchers have consistently noted that the problem requires remediation not just as a matter of social policy, but also to maximize board operational performance. Stakeholders are also increasingly demanding that boards pursue social justice imperatives reflecting public interest values that facilitate diversity, equity, accessibility, and inclusion. This study employed a Clark and Estes gap analysis in evaluating knowledge, motivation, and organizational (KMO) influences that serve as barriers or facilitators to improving racial and ethnic diversity on a museum of art’s board of directors. A review of relevant literature identified presumed KMO influences potentially limiting the board’s racial and ethnic diversity. Identified stakeholder needs and influences were assessed and validated or partially validated through analysis of data from multiple sources. Findings suggest increased knowledge and motivation will facilitate adoption of policies, procedures, and best practices to improve the board’s diversity. Triangulated data analysis also confirmed the study’s conceptual framework suggesting that organizational influences present significant impediments to achieving board diversity performance goals, including a misalignment between culture and climate. Under the New World Kirkpatrick Model, a set of recommendations together with an implementation and evaluation plan based on validated influences is provided. The recommendations are intended to implement a concrete range of policies, procedures, strategies, and best practices that will serve to facilitate increased board racial and ethnic diversity.