John Peiffer is a partner with the Orange County, California law firm of Brown & Streza, LLP. John counsels a wide range of nonprofit and tax-exempt organizations, including both public charities and private foundations, with a particular emphasis on religious organizations. He advises dioceses, religious orders, private religious schools, and other religious institutions on mission-focused corporate restructuring, governance, and compliance.

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John also co-founded and serves as President and General Counsel of the Napa Legal Institute, a nonprofit organization focused on providing corporate, tax, philanthropic, and other non-litigation legal and financial education for faith-based nonprofits.