Mary Ann Webb received a Bachelor of Science degree from Illinois State University in 1978 and became a Certified Public Accountant (CPA) the same year. She began working at Henning, Strouse, Jordan & Sulaski in 1978. She assisted William D. Sulaski in forming a new firm in 1982 and became a partner in Sulaski & Webb, CPAs in January 1984.
She is a member of the American Institute of Certified Public Accountants and the Illinois CPA Society. She has served on various committees and board of the Illinois CPA Society and is a past-president of the Illinois CPA Endowment Fund Board. She is a member of the Bloomington Rotary Club and Treasurer of the Bloomington Rotary Foundation and Rotary District 6490. She serves on the Chestnut Health Systems Board of Directors as Vice-Chairman, is the Chair of the YWCA of McLean County Foundation Board and also Chairs the Bloomington Public Library Foundation Board. She also serves on the Illinois State University Foundation Board and the College of Business and Accounting Advisory Boards.