Paul V. O'Leary was a real estate appraiser and attorney who specialized in forensic appraisals and the appraisal of conservation properties. He wrote, taught, and lectured extensively on real estate economics and appraisal for The Appraisal Institute, The Massachusetts Board of Real Estate Appraisers, the American Society of Appraisers, and the Massachusetts and United States Bar Associations. He was also a special faculty member of the Lincoln Institute for Land Policy in Cambridge, Massachusetts, a think tank associated with Harvard University, with an international portfolio, researching, publishing, and teaching on real estate planning and taxation issues.