Meet Our Staff

As our client, you will have a team of highly qualified professionals working for you to provide you with the best coverage for you, your family, or your business.  Building a long-lasting relationship with our clients is our number one priority.

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Joel Sterk

President/Managing Partner, Employee Benefits Specialist

Joel has been with the agency since April 1, 1980. He follows in the family tradition of his grandfather and father by being a third generation agent and partner.

His area of expertise is Employee Benefits, including Group Medical Insurance, Pensions and Life Insurance.

Joel is currently one of four (ABC) Associated Builders and Contractors Merit Choice agents in Wisconsin with a territory covering Madison to the Upper Peninsula.

Joel is married to Barbara Sterk and has 3 grown sons, 2 daughter-in-laws, and 3 grandchildren. In his spare time he likes to golf or snowmobile depending on the season.

Joel is pleased that his son Jordan and daughter-in-law Brette are also following in the family tradition of working at the agency.

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John Theune

Partner, Personal and Commercial Lines

John has been in the insurance industry since 1990. John moved to Waupun in 1992 and has been with SIA Insurance Services since that time.

He specializes in both Personal and Commercial lines of business.

John is married to Ann and has three children. In his spare time he likes to golf, coach, and spend time with family.

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Peter Hansen

Commercial Lines Specialist

Pete is a 1971 graduate of UW-Stevens Point. He started his insurance career as an underwriter with Sentry Insurance in 1972, and then moved on to Ohio Casualty as an underwriter and marketing representative in 1976. He called on the Sterk Insurance Agency as their marketing representative for five years, before being asked to join the agency in 1989, as a partner and commercial lines specialist. He is happy to have made the decision to join the agency and make Waupun his home.

Pete is married to Kay Hansen (the Librarian) and has two men (Dave and Mike), one woman (Lisa) and five grandchildren.

Pete has been on numerous boards and committees over the years and is currently active in the Waupun Rotary Club, the Board of Education at Pella Lutheran Church and the Board of Directors at The National Bank of Waupun.

In his spare time, he enjoys sports, trips to northern WI and listening to exciting golf stories, as told by partners John and Joel.

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Jonathon Venhuizen

ChFC®, CRPS®, CLU®, Chartered Financial Consultant®, Chartered Retirement Plans Specialist®, Financial Advisor

Jon has been with SIA since June 2007. His areas of expertise are all types of retirement planning, investments, 401k plans (including prevailing wage 401k plans), and life insurance.

Jon currently works closely with Associated Builders and Contractors as a Merit Choice representative and a member of their legislative committee.

Jon holds the designation of Chartered Financial Consultant® (ChFC®), Chartered Life Underwriter® (CLU®), and Chartered Retirement Plans Specialist® (CRPS®) from The American College. The ChFC® designation currently requires more courses than any other financial planning credential. The curriculum covers extensive education and application training in all aspects of financial planning, income taxation, investments, and estate and retirement planning.

Jon is currently the Vice President of the Board of Directors for the Waupun Chamber of Commerce, sits on the board of the Waupun Kiwanis club, and is heavily involved with the Union Youth Center and First Christian Reformed Church. He is active in volleyball and softball leagues and an avid Wisconsin sports fan.

Jon and his wife Kim live in Waupun with their two children, Ryker and Jaina.

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Jordan Sterk

Personal Lines Agent

Jordan has been with SIA since July 2009. He specializes in Homeowner’s, Automobile, Health and Medicare Insurance plans.

What Jordan enjoys most about his job is interacting with people on a daily basis.

In his spare time, he enjoys going to Brewer games, fishing, and spending time with his wife Lindsay and newborn son Camden. He is also a member of the Waupun Lions club.

Jordan grew up in Waupun, and is a fourth generation agent of SIA Insurance Services.

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Matt Syens

Commercial Lines Consultant

Matt Syens brings to SIA Insurance Services over 15 years of professional experience working in the best interest of business owners and families. Matt graduated from Calvin College with a Bachelor’s Degree in Business in 2001. He then started his career working for the Wisconsin Office of Commissioner of Insurance for 5 years and then transitioned closer to home to work in the banking industry.

Matt has his Property and Casualty insurance license from the State of Wisconsin and will be focusing heavily on commercial insurance products and solutions. He is a high energy insurance professional who is dedicated to taking care of his clients’ needs and ensuring they find the right coverage to protect their assets from unexpected losses.

In his spare time, Matt enjoys coaching youth sports and is heavily involved in the Waupun Hoopsters and Randolph AAU basketball programs. Matt is also on the Central Wisconsin Christian School Board and Educational Foundation of Waupun Board.

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Kate Burk

Agent - Individual and Medicare Health Plan Advisor

Kate Burk is an Individual and Medicare Health Plan Advisor, who has been with SIA Insurance Services since 2013. What Kate enjoys most about her job is being able to help individuals, families, and seniors to find health insurance plans to fit their medical needs and budget.

Prior to coming on board with SIA, Kate worked as a CSR for a health insurance carrier and acquired extensive experience with individual, medicare, and group medical plans.

To be closer to family, Kate relocated to Wisconsin after graduating from the University of South Florida. In her spare time Kate enjoys the outdoors, baking; and spending time with family, friends and her husband Kevin.

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Steve Oosterhouse

Agent - Farm Specialist

Steve has been with SIA since December 2013; he specializes in Farm, Crop, Hail, Multi-Peril, Commercial, Personal and Health Insurance out of his Randolph office.

With 22 years of Insurance experience, Steve’s favorite part of being an agent is getting to meet new people and helping them find the proper coverage to protect their assets.

Steve and his wife Ev reside in Randolph, they both enjoy spending time with their four children and four grandchildren.

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Dan Zeratsky

Personal and Business Lines Specialist

Dan has been with SIA since November 2007. He handles Commercial and Personal Lines.

What he enjoys most about his job is the interaction with good people and the chance to help protect their assets.

In his spare time, Dan enjoys outdoor activities. He is also involved in youth sports programs in the Fox Valley Area.

Dan grew up in Green Bay, WI. He is married to Deborah and has 2 children.

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Cheryl English

Securities Client Service Representative

Cheryl English brings to SIA Insurance Services over 26 years of experience working in the insurance/financial industry. Cheryl has maintained her insurance producer’s license since 1999 and graduated from Illinois State University with a Bachelor’s Degree. She is a creative and results-oriented business leader. Cheryl prides herself on her commitment to high quality customer service and helping meet the individual needs of a diverse client base.

Cheryl recently relocated to Waupun to be in close proximity to family. She has two married daughters and five beautiful grandchildren, whom are the light of her life.

In her leisure time, Cheryl enjoys cooking, yoga, exercising, immersing herself in the great outdoors, and most importantly, spending quality time with family and friends.

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Hollie Ten Pass

Personal Lines Customer Service Representative

Hollie has been with SIA Insurance since November 2014. She is licensed in Property and Casualty but primarily works with personal lines.

What Hollie enjoys most about her job is the people she works with and the interaction that she has with clients in person and on the phone.

Hollie enjoys playing golf with her family and being around friends and family. She also enjoys watching the Packers and traveling to new places.

Hollie grew up in Waupun, and after graduating from Dordt College with an Administrative Degree, returned back home to be closer to family.

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Cheryl Harmsen

CISR, Certified Insurance Service Representative - Personal Lines

Cheryl joined the SIA team in March of 2014. Cheryl comes to SIA with having worked in the insurance agency since 2012, and has recently completed her CISR designation. She is licensed in property, casualty, life, and health.

Cheryl is most excited about working with the great people in this area and striving to make their insurance experiences as trouble-free as possible.

Cheryl has been living in Waupun since 1990 with her husband Kevin; and they have three wonderful children, Shawna, Alyssa and Danny. In her free time, Cheryl enjoys spending time with family and friends, serving her church in various capacities, home improvement projects, gardening, and traveling.

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Patricia (Pat) Ellie

Individual Health Specialist

Patricia (Pat) Ellie has been with SIA since December 2008. She specializes in Health Insurance especially Medicare Supplements and Medicare Advantage Plans. Pat is also licensed for Life, Property, and Casualty. Pat enjoys meeting her prospective clients and getting to know them on a personal level.

In her spare time Pat likes to fish, camp and garden (flowers and vegetables). She is involved in the Markesan Chamber as Secretary and enjoys her membership in the Princeton Garden Club. She grew up in middle Wisconsin and moved to Milwaukee as a child. Pat is married to Dale Ellie and has lived in the Green Lake Area since 2004. Pat and Dale have two married children and two grandchildren.

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Sara Oosterhouse

CISR, Certified Insurance Service Representative - Personal Lines

Sara has been with SIA since October of 2008. She is licensed in Property and Casualty, working primarily in Personal Lines.

Sara reduced her hours in 2012 to part-time in order to spend more time at home with her baby boy. What Sara enjoys most about her job at SIA is the personal relationships she is able to enjoy with both the customers and her co-workers.

Sara is originally from MN but moved to the area after graduating from Trinity Christian College. In her spare time, Sara loves to be outside biking or walking with her husband, Mike and son Isaiah, reading, or enjoying time with family and friends.

Mike Lassila

Agent, All Lines of Coverage

After graduating from UW-Milwaukee with a dual-option BBA, Mike joined Wausau Insurance as an Employee Benefits Consultant in 1977 out of their Kansas City Office. He then became a Regional Sales Manager for the Ohio Casualty Group and was named “Man of the Year” in 1983. Mike joined SIA in 1991 and handles all lines of insurance out of SIA’s Jackson office.

Mike has a keen appreciation of the required skill-set of small business owners after many years of insuring them.

Away from the office, Mike and his wife, Patty, enjoy spending time with their three children. Something you might not know about Mike is that he thinks of himself as a “Yooper” and has family which lives on Lake Superior shores.