The head of the Financial Industry Regulatory Authority’s arbitration and disciplinary hearings units will retire in November after working with the regulator for the past 18 years, FINRA announced on Wednesday.

Linda Fienberg, 72, joined FINRA in 1996. During her time with the agency, she led several rule changes to the arbitration process, including one in 2011 that gave all investors who filed arbitration claims the option of choosing an all-public panel. She also created FINRA’s Office of Hearing Officers to hear cases the agency brings against Wall Street firms and brokers.