William St. Clair

William St. Clair is a Wealth Advisor at Prosperity and a Private Client Service Partner at EisnerAmper. With over 40 years of experience, Bill brings deep expertise in wealth management, investment advice, retirement planning, risk and asset protection.  

Bill specializes in financial and estate planning, covering real estate, tax-free exchanges, Delaware Statutory Trusts (DSTs), and annuities. With a detail-oriented approach, he crafts reliable financial plans and provides hands-on account management, making him a dependable partner in his clients' financial journeys. Bill’s client-first philosophy emphasizes respect, prompt communication, and follow-through on every commitment—qualities that foster trust and long-lasting relationships. 

Before joining the firm, Bill was the Founder of St. Clair CPA Solutions, P.C. The firm was a leading accounting, audit, tax, advisory, and financial consulting firm. 

Credentials & Education

• Certified Public Accountant (CPA) 
• FINRA Series 6, 7, 63 & 65
• Insurance: Life, Accident and Health (LHL) 

• LaSalle University: BS, Accounting; BA, Economics

Affiliations

• American Institute of Certified Public Accountants 

• Pennsylvania Institute of Certified Accountants 
• Friends of Father Judge High School: Chair, Board of Directors
• The National Eagle Scout Association