At Diemer Accounting & Tax Service, Inc., our talented staff has the expertise to meet the needs of our diverse client base. Why not take a few minutes and get to know the most experienced and knowledgeable tax and accounting professionals you’ll ever meet?

Our Team

Ruth Diemer

President, Founder
Ruth, the founder of Diemer Accounting & Tax Service, Inc., has chosen to retire after over 50 YEARS of dedicated service to her tax clients.

Ken Diemer

 Grand Valley State University

Vice President, Business Management Specialist
Ken is an expert in analyzing your business need and helping your business grow and remain profitable. Ken is involved in all aspects of accounting and tax services for our clients. He has been preparing tax returns for 30 plus years and specializes in partnership and corporation tax returns. Another area of Ken’s expertise is rental real estate as he is a partner in rentals himself. He attended Grand Valley State University for four years.


Wanda Ridlington

Tax Preparer
Wanda has been preparing tax returns for 30 plus years. Wanda prepares all aspects of individual tax returns. Her expertise in individual tax returns extends particularly to daycare returns, as she was once a daycare provider herself for many years.

Christie Wisniewski

 Baker College
 Associates Degree in Accounting

Accountant/Payroll Specialist
Christie is our payroll extraordinaire. She handles all aspects of payroll. From payroll processing to monthly and quarterly payroll reports. Christie not only handles payroll for clients locally, but can also handle payrolls for clients across the United States. She has worked for Diemer Accounting since 1992.

LeighAnn Hawver

 Ferris State University – Accounting Degree

Leigh Ann has worked in manufacturing and non-profit and is now working here at Diemer. She does the accounting at all different levels for a variety of companies. She is married and has lived in Grand Haven her entire life, has 2 adult children and enjoys running and spending time with her family.

Marc Myrick


Tax Preparer

Lynn Walters


Lynn has worked at Diemer Accounting since August of 2018. She lives in Zeeland with her family and has worked at several offices in the Zeeland Area. She owned her own tax business for many years. At Diemer Accounting and Tax Services Lynn has several roles – Administrative Assistant to Ken Diemer and Ruth Diemer, helping out at the front desk and some accounting and tax return work also. Lynn is also involved in the local BNI group – Who2GoTo which meets in the Holland/Zeeland Area once a week.

Mikayla Calvert