• efficiency
  • peace
  • hope

Limestone Staff

Located in Sioux Falls, Yankton and Brookings

Limestone has a dedicated team of bookkeeping professionals in South Dakota that are ready to provide quality bookkeeping service to your business. Our experienced staff takes the time to understand your business, your vision and your goals to map out clear directions for your success.

Founder - Steve Mix


Founder and President
Steve Mix | Sioux Falls

As Founder and President, Steve’s vision is to help business owners achieve success by building from a solid foundation of proven processes. He has been in the business of professional bookkeeping since 1996 and has served as controller for companies in commercial flooring, high-end home furniture, swimming pools and commercial furniture. Steve believes in always learning, teaching others what he has learned and that the more you give the better your life becomes. He also serves as the local Area Director for Business Networking International. 

Steve is married to Lisa and they have one son and one daughter. He also loves watching soccer and hunting in the fall. Steve holds Bachelor of Science degrees in Economics and Accounting and a minor in Chemistry.

Bookkeeper - Tom Parker


Director of Client Services
Tom Parker | Sioux Falls

Tom joined Limestone in 2012 with a passion to share the company’s core values and a desire to help small businesses thrive. He has 22 years of experience as a manager and small business owner, including 11 years in manufacturing and distribution, four years as plant manager for an international firm, and three years as a business owner in the retail and hospitality industries. He also had a two-year stint as a manager and certified installer of a local geothermal drilling business.

Tom has a wife and son and enjoys camping, running, volleyball, home improvement projects and visiting family out of state. He holds a Bachelor of Science degree in Business and Operations Management.

Bookkeeper - Cheryl Beck


Cheryl Beck | Yankton

Cheryl joined the Limestone team in 2012. She has over 30 years of experience in accounting, payroll, sales and excise taxes, inventory controls, job costing, financial reporting, budgeting, and cash flow management across multiple industries. Cheryl loves to help people and businesses grow and succeed.

Cheryl’s expertise was recognized by the Yankton Chamber of Commerce in 2016 with their New Business Excellence award and she has completed the Leadership Yankton program. Cheryl is very active in the community and with her family. She has a Bachelor of Science degree in Accounting with a minor in Computer Science from Northern State University.

Bookkeeper - Glen Den Hoed


Glen den Hoed
| Sioux Falls

Glen joined the Limestone team in 2012 and specializes in bookkeeping and tax return preparation. Prior to joining Limestone, he spent 16 years in construction and management. His goal is to provide business owners with peace of mind that their books are accurate and up to date and that they have the right tools to make important business decisions.

Glen and his wife Jammie have three daughters and they enjoy camping, hunting and fishing. Glen holds a Bachelor of Science degree in Accounting.

Bookkeeper - Mike Ehlers


Mike Ehlers
| Sioux Falls

Mike joined the Limestone team in 2007 and has experience in retail sales and management. His goal is to partner with you to learn about your business so you can accomplish all of your business dreams. Mike enjoys becoming a part of your team, developing a meaningful relationship, and providing you, the business owner, with the peace that comes from knowing exactly how the business is performing financially.

Mike and his wife Courtney have four children and in their free time are usually supporting the kids’ sporting or musical pursuits. Mike has a Bachelor of Science degree in Music Merchandising from South Dakota State University,

Bookkeeper - Sherry Roed


Sherry Roed | Sioux Falls

As part of Mix Bookkeeping and Tax since 2010, Sherry played an integral role in the development and transition into the Limestone brand in 2011. She has six years experience working with multi-state payroll and payroll taxes at a national hotel chain. Sherry’s background includes 15 years in the medical and HVAC industries. Her keys to success are to listen to what the client is asking for and treat others the way that she wants to be treated.

Sherry enjoys spending time with her family and reading and doing crafts. She holds a Bachelor of Science degree in finance, an Associate of Arts degree in accounting, and a Master’s degree in Business Administration.

Bookkeeper - Holly Hirsch


Holly Hirsch | Sioux Falls

Holly is a small business owner of five years and has worked in office management in the fields of retail, mental health, insurance and auto repair. Holly has experience in payroll, accounts payable, accounts receivable and sales tax. Her desire is to take on any bookkeeping task that will allow the business owner to be able to concentrate on what they do best – run their business.

Holly and her husband have three boys. In her free time, Holly is heavily involved in her children’s sports, namely soccer and basketball, as a manager to one team and a treasurer for two. Her favorite part is the time spent talking to the kids in the car on the way to and from events – whether they are in town or 13 hours away.

Bookkeeper Tara Theel Bookkeeper
Tara Theel | Sioux Falls

Tara has over ten years of experience in bookkeeping and accounting including payroll, accounts payable, accounts receivable, financial statement reporting and account reconciliations. She gives 110% to all of her clients and she always has a smile on her face.

Tara and her husband have a young son and they enjoy biking, camping and boating with friends and family. She also has a passion for photography and scrapbooking. Tara has an Associate’s degree in Business Administration.

Krystal Stulgies
| Yankton

Krystal has experience in a variety of industries from agricultural to health care to advertising. She has more than 10 years of bookkeeping experience and prides herself on her ability to adapt.  She completed the Leadership Yankton program in 2018 and enjoys giving back to her community through Junior Achievements.

Krystal and her husband Adam have a young son. They enjoy the outdoors and music of all kinds. She has a Bachelor of Business Administration (BBA) from Texas State University, San Marcos.

Bookkeeper - Deb Eilers Bookkeeper
Deb Eilers | Brookings

Prior to joining Limestone, Deb gained over 25 years of management experience in both accounting and law. She has had leadership roles in retail, manufacturing, landscape architecture and information technology. She has a passion for always searching for a better way and loves reading, fishing and biking with her husband.

Deb holds a Bachelor of Science degree from the University of Illinois, a Master’s degree in Business Administration from Lake Forest College and a Juris Doctor degree from the Loyola University, Chicago.

Bookkeeper - Brenda Spencer Bookkeeper
Brenda Spencer | Yankton

Brenda recently joined Limestone and has several years of bookkeeping experience as well as many years of involvement in the Yankton community.

Brenda has a Bachelor of Science degree in Business Administration from the University of Nebraska-Lincoln.

Brenda has continually shown her commitment to the community, her coworkers and Limestone’s clients.

Joann Messersmith | Sioux Falls

Joann joined the Limestone team in 2017.  She has been doing bookkeeping for over 18 years, with extensive experience in the construction industry and property management. She enjoys learning about you and your business passions, and helping your business become even more successful.  She understands that your business can be all-consuming for you, and strives to bring you peace, by understanding what is happening in your business.

Joann holds a bachelor’s degree from the University of Wisconsin at Whitewater, with a major in Small Business Management and a minor in Public Relations, and a South Dakota Real Estate Broker’s License.

Brittany Spurling | Sioux Falls

Brittany joined the Limestone team in 2019 with a shared passion for helping small business owners succeed. She has experience in accounts receivable, accounts payable, financial reporting and banking. Brittany has a passion for learning and understanding new businesses and hopes to put that passion to work bringing business owners peace of mind in their financials.

Brittany and her husband enjoy traveling to new destinations both home and abroad. Brittany also has a love of rabbits, particularly mini lops. She currently has a grey and white mini lop her and her husband adopted from the Animal Rescue League.

Brittany holds a Bachelor of Science in Accounting from AIB College of Business. 

John Herrboldt | Yankton

John joined Limestone in 2019 with both internal and external bookkeeping experience.

John earned a Bachelor of Arts degree in Accounting from the University of Sioux Falls and is in the MBA program at USF (Class of 2020).

John enjoys building relationships with clients and helping provide peace of mind to business owners and managers. He is a proud father and husband, enjoys the outdoors and has many interests.

Mike Huber | Sioux Falls

Mike joined Limestone in 2018.  He spent the early part of his career traveling and installing accounting systems for hospitals, grocery stores, and government.  Later, after teaching in China, he returned to Sioux Falls and worked as a controller for a steel fabrication company.  While following his spouse during her further education, he picked up yoga, financial planning and business consulting.  

Mike and his wife like the outdoors for kayaking, biking, and hiking.  They also like to travel internationally to large cities with a variety of historical sites and museums.

Vonda Shaeffer | Sioux Falls

Vonda joined Limestone in 2019. She has 14 years of accounting and bookkeeping experience, including payroll, accounts payable, accounts receivable, sales/excise tax, inventory, and financials. Her fields of expertise include agronomy, farming/ranching, manufacturing, and continuous improvement. She has owned and managed her owned businesses and worked for international and Fortune 400 companies. She truly enjoys getting to know people and helping them grow their businesses.

Vonda earned her Bachelor of Accounting (Summa Cum Laude) and Master of Professional Accountancy Degrees at the University of South Dakota. She is married to Jim Shaeffer and they enjoy hunting, fishing, traveling, movies, and serving. They are avid members of the NWTF and Crosswalk Community Church. 


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