Our Firm

We combine the experience of a large firm with the personal attention that only a small firm can provide. Our two partners have over 50 years of combined experience in public accounting.  Our clients come back to us year after year because they know they are in good hands. We work to develop long-term relationships; whether your needs are simple or complex, we can help.  We take pride in providing quality work on a timely basis, in complete confidentiality, in a friendly manner, and for a fee that is fair.

Please take a moment and read more about our peopleour historyour credentials, and our areas of specialization. If you have any questions or would like more detailed information about how we can help you, don't hesitate to contact us. We would be happy to serve you.


Our Job Opportunity

Contact us for current openings.


Our People

Darlene D. Petkwitz, CPA


Darlene opened this practice in June of 2000 under the name of Petkwitz & Ault, Inc.  She has been the principal owner and operator of the firm.  Now the firm has become Petkwitz & Ketner, Inc.  She has worked in public accounting in northwest Ohio for 30 years, including The Nichols Company, Radel and Company, and Norton and Petkwitz, Inc.  She has been partner in local firms since 1994.

While not originally planning to become a CPA, Darlene's early work experiences included teaching basic business courses at the high school level, working as a bookkeeper for small businesses, and working in the field of urban planning.  She returned to college to embark on a career as a CPA because the desire to do this kind of work was so strong.

Darlene's areas of concentration include individual, business, and tax-exempt organization tax returns.  She also specializes in personal bookkeeping services.

Education and Professional Affiliations

B.S. in Education, Geography Major and Business Education Minor
Bowling Green State University, Bowling Green OH, 1971

Master of Arts, Geography
Bowling Green State University, Bowling Green OH, 1973

Ohio License # 29329

American Institute of CPAs
Ohio Society of CPAs

 Community Affiliations

President, Bowling Green Kiwanis Scholarship Foundation, 2011-present
Bowling Green Kiwanis Club, Past President, 2008-2009
Bowling Green Kiwanis Club, Past Board Member, 2007-2010
Bowling Green Chamber of Commerce, Past Trustee, 2002-2004
Bowling Green Chamber of Commerce, Member Budget and Finance Committee, 2002-present
Secretary and Trustee, Hancock-Wood Community Trust Fund (aka Operation Round Up), 2008-present
Sisters of Saint Francis of Tiffin, Ohio, Member Financial Advisory Committee, 2010-present
BG Leadership Class of 1993-1994, Bowling Green Chamber of Commerce
Wood County Humane Society, Past President, Vice President, Treasurer, Membership Chair, 1997-2003
ABCD-READ volunteer tutoring of adults, Wood County District Public Library, 1992-1994


Life Partner - Jeff Major
Cat - Rosalita 
Resident - Rural Wood County for 40 years
Award - Athena Award recipient, 2007, presented annually by the Bowling Green Chamber of Commerce to someone who 1) actively mentors, supports, and develops women in realizing their full leadership potential; 2) demonstrates excellence, creativity, and initiative in their business or profession; 3) provides valuable service by contributing time and energy to improve the quality of life for others in the community.
Award - Wood County Humane Society Volunteer of the Year, 1994. 


 Mary Jo Ketner, CPA


Mary Jo joined Petkwitz and Ketner, Inc. in December 2011.  She brings with her over 30 years of experience in public accounting.  A graduate of The Ohio State University Honors Accounting program, she began her career as an auditor with the Big Eight accounting firm Peat, Marwick, Mitchell, now known as KPMG.  She has worked with several local accounting firms in Northwest Ohio on both a full time and part-time basis over the past 28 years in addition to managing her own small tax practice.  These included Tebay & Associates, Norton & Stott, Norton & Petkwitz and Lublin Sussman Rosenberg & Damrauer. 

Mary Jo's areas of concentration include business, individual, trust and estate tax returns. 

Education and Professional Affiliations

B.S., Business Administration, Accounting Major
The Ohio State University, Columbus, OH, 1978

Ohio License # 13212

Notary, State of Ohio

American Institute of CPAs
Ohio Society of CPAs

Community Affiliations

BG Leadership Class of 2011-2012, Bowling Green Chamber of Commerce
President, Auxiliary to the Ohio Veterinary Medical Associations, 2011- 2013
St. Aloysius Catholic Church, Former Finance Council member - 2007 - 2014, Audit Committe Chair, Former Finance Council Chairman - 2007-2010
The Ohio State University Alumni Association
The Ohio State University President's Club
The OSU Alumni Club of Wood County - Former Board member and Student Send-off Co-Chair; Past President, Past Secretary, Past Treasurer
OSU Wood/Lucas County Scholarship Fundraiser - The Ohio State University Marching Band in Concert - Publicity Chairman - 2015, 2011, 2007, 2003, 1999
Past Treasurer:  Bowling Green Youth Hockey Association, Kenwood Elementary Cub Scout Pack 358
Past Board member:  Bowling Green Swim Club, Bowling Green High School Booster Club
Past 4-H Advisor - BG Brigade 4-H Club


Married - Mark Ketner
Four Adult Children - Matthew, Lisa, Jennifer and Scott
Dogs - Ruby Rue and Harper


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Our History

The original firm, Petkwitz & Ault, Inc. began in the summer of 2000, offering tax and accounting services for individuals and small businesses.  Darlene Petkwitz has developed the firm into one that specializes in tax work for individuals with more complex returns, as well as descedent's estates, and tax-exempt organizations.  Personal bookkeeping services has also been a constant offering.  With the addition of Mary Jo Ketner late in 2011, the firm brings a more well-rounded set of services, including trust, estate, and gift tax return preparation. 

We have always been in the forefront of electronic filing and ever-changing tax regulations.  We have helped our clients attain a comfort level with these changes, while maintaining a personal touch to all of our work. 

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Our Credentials

Our firm participates in the Peer Review program prescribed by the American Institute of Certified Public Accountants and the Ohio Society of Certified Public Accountants.  Our firm was last reviewed in October 2017  for the period ended April 30, 2017.  The resulting report stated that all of our accounting practices and procedures complied with professional standards in all material respects.  Our firm received the rating of pass.  Firms can receive a rating of pass, pass with deficiency(ies), or fail. 

Our firm registration number as assigned by the Accountancy Board of Ohio is 43402044.


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Our Areas of Specialization

Petkwitz and Ketner, Inc is a full-service accounting firm.  We prepare tax returns, and provide tax consultation and planning services.  We issue compiled and reviewed financial statements for our clients, and also perform agreed upon procedures for clients that request that type of service.  We have the ability to provide bookkeeping and accounting services for businesses and individuals.

Tax Return and Consultation
With over fifty years combined experience, we have the knowledge and expertise to not only prepare accurate tax returns, but we also have the ability to provide you with creative solutions to your tax and accounting issues.  We have experience in preparing all types of returns including Form 1040 for Individuals, 1041 for Estates and Trusts, 1120 for C Corporations, 1120S for sub-chapter S Corporations, 1065 for Partnerships and multiple member LLCs, 990 for Tax Exempt Organizations, 706 for Estates, and 709 for Gift Tax.  We file returns electronically which expedites refunds.

Financial Statement Compilation and Review Services
Businesses may want to have financial statements prepared for lending, bonding or other purposes and we can provide compiled or reviewed statements for them.  We have found that businesses and organizations also request our services to perform agreed upon procedures to look at specific issues in their accounting or internal control function.

Personalized Bookkeeping and Accounting Services
We perform bookkeeping and accounting services for individuals and businesses who need someone to pay bills or to track their income and expenses.  This includes busy professionals that do not have the time to do this and older individuals who see this task as too overwelming.  We work with out-of-area relatives to provide peace of mind that their loved ones bills are being paid timely and provide them with monthly statements of activity. 

New Business Consultation
When starting a new business, one of the most significant decisions being made is the type of legal entity to select.  There are critical tax implications that should be considered when forming new businesses.  We work with attorneys in selecting the appropriate entity type for a business based on the individual situation being presented.  We can assist in filing an S Corporation election, if needed, and getting an employer identification number.  We can also set up a new business for state sales tax reporting, various payroll withholdings, and other filings that may be required.

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Petkwitz & Ketner, Inc.

1052 W. Wooster St. 
Bowling Green, OH 43402

Phone: 419.352.5544

Fax:  419.353.5577

Email: maryjo.ketner@pandkcpas.com

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