Our Team

Jim Dedyne


CPA, Principal

INDUSTRY EXPERTISE: Affordable Housing
Small & Midsize Businesses
DEPARTMENTS: AccountingAuditTax

Jim Dedyne, CPA, Principal

Jim joined Maner Costerisan more than 35 years ago. Since then, he’s been a consistent presence, providing expert accounting and tax guidance to small and midsize businesses and nonprofits across the Great Lakes region. Driven by the desire to help clients achieve their business goals, Jim strives to continuously improve his skills and take on any challenges that come his way. He credits being a good listener and asking questions to his success.

Named to the principal group in 2000, Jim was inspired to pursue an accounting career by a close college friend who also went into public accounting. His father, an insurance agent, also played a defining role in his financial background. Prior to joining Maner, Jim worked as a staff auditor at PWC and served for seven years in the loan department at Michigan National Bank.

Gregarious, outgoing and one of the friendliest people you’ll ever meet, Jim has earned the beloved nickname, “Jimbo,” by clients and staff alike. With more than four decades of financial expertise, Jim brings veteran leadership, experience and wisdom to the firm. His down-to-earth style and approachability puts clients at ease from the moment they meet him.

A fan of golf, chess, bike riding and reading, Jim was born and raised in St. John’s, Michigan, where he continues to reside with his wife, Heather. The pair have three grown children, Mitchell, Grant and Meg.

My favorite part of my job is to work with clients to help them achieve their desired business goals. It’s what keeps me energized and excited to come to work every day.

Years of Experience



American Institute of Certified Public Accountants (AICPA)

Michigan Association of Certified Public Accountants (MICPA)

Communities in Schools of Michigan, Board Member


Certified Public Accountant (CPA)