O’Connor & Associates is a full-service real estate services firm headquartered in Houston, Texas. Founded in 1974 by Patrick O’Connor as an appraisal company, the firm has grown into one of the nation’s leading property tax consulting organizations. Mr. O’Connor holds the MAI designation, the highest credential awarded by the Appraisal Institute, and earned his MBA from Harvard University.

With over 50 years of experience, O’Connor & Associates employs more than 1,000 professionals worldwide, representing 185,000 clients across 49 states and Canada, with continued expansion into additional markets.

The firm operates across four core business lines: property tax appeal and consulting, appraisal services, cost segregation, and a proprietary data subsidiary supporting appraisers nationwide. Known for its creativity, aggressiveness, depth of data resources, and experience in property tax appeals, O’Connor helps property owners collectively achieve over $100 million in property tax savings annually, earning a reputation as one of the most successful and trusted property tax consulting firms in North America.