More than 30 years ago, Mr. Mazz started his accessibility career with the University of Maryland's Section 504 Transition Plan. Since then, he has been responsible for the accessibility projects in his private practice and in the offices of Edwin F. Ball, AIA and Celentano Esposito & Associates. Also, Mr. Mazz has collaborated with other nationally known "accessibility firms" including Ron Mace and Barrier Free Environments. His major clients have included the Architect of the Capitol, other Federal agencies, and Howard County Public School System, housing developers and architects. In his eight years with the Federal Government, Mr. Mazz was an architect in DOJ’s Housing and Civil Enforcement and Disability Rights Sections and the senior advisor on accessibility issues in HUD’s Office of Fair Housing and Equal Opportunity. More than 70% of his career has focused on accessibility.

For the past 13 years, Mr. Mazz has focused exclusively on the Americans with Disabilities Act (ADA), the Fair Housing Amendments Act (FHA), Section 504 of the Rehabilitation Act, the Architectural Barriers Act (ABA), and accessible design issues. Prior to federal employment, he belonged to several disability organizations and donated services through the Spinal Cord Injury Network of Metropolitan Washington and Independence Now, Inc. He continues to donate services through the Maryland Disability Law Center. Additionally, Mr. Mazz is a board member of CALMRA, a community based residential service provider for adults with cognitive disabilities.