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Our Staff

The history of Hallmann Advisors, CPA's, P.C. is built upon a tradition of service, technical expertise, and innovative thinking to meet the needs of a rapidly changing world. The experience and academic credentials of our partners and staff provide our clients with the expertise of larger firms, while our commitment to superior customer service offers a personal, one-on-one approach.

We invite you to meet our in office staff:

Our Team

William P. Hallmann, CPA, Principal

248-625-2727 Ext. 101 Bachelor of Science in Business, Major in Accountancy, Ferris State University,

Member of the American Institute of Certified Public Accountants, Michigan Association of CPAs. Bill also is a Securities Representative and holds securities licenses Series 7 and 66

Suzette Hallmann, Director of Marketing and Sales


Business Development and Client Relationship Professional Collaborating with the firm’s professionals, Suzette helps devise a solution of services to ensure these businesses’ needs are met. Whether its local of nationwide, she’ll bring the right resources together to deliver sound audit, accounting, tax planning, wealth management, merger and acquisition, payroll, or business advisory services.


248-625-2727, Ext. 104 Associates Degree in Business Management

Martha Jarrett, Staff Accountant

248-625-2727 Ext.103

Sharon Sinclair, Executive Office Manager

248-625-2727 Ext 100 Notary