Bill Gassel

Partner –CohnReznick Advisory LLC

CPA,Partner – CohnReznick LLP

As a partner in the National Assurance group, Bill Gassel  focuses on assessing, developing, structuring, and managing internal quality control monitoring systems. 

Experience and credentials

Certified Public Accountant 
Extensive experience working within the regulatory environment
Skilled at preparing engagement teams selected for PCAOB engagement inspections and addressing PCAOB questions and comments
Previously led a team that developed the monitoring program and approach for a system of quality management under ISQM 1
Experience performing reviews of U.S. and foreign member firm systems of quality control
SEC experience includes helping to design a company-wide approach and implementation of SEC Section 404 for internal controls
Before joining CohnReznick, Bill was the ongoing monitoring leader for a Big Four firm where he was responsible for reviewing in-process engagements and leveraging firm and audit engagement data for analysis related to audit quality, including audit quality indicators

Education

M.B.A. – Washington University
B.S., Accounting, summa cum laude – Missouri State University  

Professional affiliations

Certified Public Accountant, Connecticut
Certified Public Accountant, Missouri
Receive CohnReznick insights and event invitations on topics relevant to your business and role.
Subscribe

"CohnReznick" is the brand name under which CohnReznick LLP and CohnReznick Advisory LLC and their respective subsidiaries provide professional services. CohnReznick LLP and CohnReznick Advisory LLC (and their respective subsidiaries) practice in an alternative practice structure in accordance with the AICPA Code of Professional Conduct and applicable law, regulations, and professional standards. CohnReznick LLP is a licensed CPA firm that provides attest services to its clients. CohnReznick Advisory LLC provides tax and business consulting services to its clients. CohnReznick Advisory LLC and its subsidiaries are not licensed CPA firms.

member of nexia

CohnReznick is a member of Nexia, a leading, global network of independent accounting and consulting firms. Please see the “Member firm disclaimer (Opens a new window)” for further details.

© 2026 CohnReznick Advisory LLC, All Rights Reserved.