Cathy Sonnentag
Social Media & Client Services

Cathy Sonnentag, a dedicated professional with a wealth of experience, currently thrives as a Social Media & Client Services specialist at Thomsen Team Realtors. With a career spanning back to 1984, Cathy has been a steadfast presence in administrative and related roles, exemplifying her commitment to organization and effective communication.

Before venturing into the world of real estate, Cathy spent a significant portion of her career as an Administrative Assistant, refining her organizational skills and attention to detail. Her journey took a heartfelt turn when she embraced a role as a Preschool Teacher from 2004 to 2008, demonstrating her compassionate nature and dedication to nurturing young minds.

Hailing from the charming landscapes of Wisconsin, Cathy’s roots run deep in the Badger State. She was born and raised in the heart of Wisconsin and presently resides in Waukesha, where she has built a life with her loving family. Married for 33 years and blessed with two sons, a daughter, and a daughter-in-law, her household is completed by a delightful Cockapoo named Hazel, adding an extra touch of warmth to their home.

Beyond her professional endeavors, Cathy treasures her time spent with family. Her love for baking translates into cherished moments with her loved ones, and her shared enthusiasm for concerts, movies, and social gatherings adds zest to her life. Her friendships are a testament to her welcoming spirit and outgoing nature.

Cathy’s commitment to education is evident through her studies at Chippewa Valley Technical College and her completion of the Dale Carnegie Course, which equipped her with valuable skills for personal and professional growth. However, her learning journey doesn’t stop there – Cathy values community involvement as much as her professional pursuits.

Cathy has played pivotal roles in the community, dedicating her time as a volunteer and Chairperson for various committees at Rose Glen Elementary and Central Middle School. Her dedication further extended to the Waukesha West Band Booster, where she served as a Board Member, Vice President, and President. Cathy’s compassionate nature led her to become a member of both the You Are Special and Operation Home Baked initiatives, highlighting her commitment to making a positive impact on the lives of those around her. Within her parish, she shines as the Chairperson of the Caring Connection, demonstrating her unwavering dedication to fostering connections and support within her community.

Cathy has been a part of the Thomsen Team for 7+ years.  She loves the flexibility and the assortment of roles that make up her position. In all her pursuits, Cathy Sonnentag radiates a passion for connecting people, whether through real estate endeavors, community engagement, or cherished family moments. Her journey stands as an inspiration, reflecting the power of dedication, compassion, and a genuine love for life.


  • Administrative Assistant and related roles since 1984
  • Preschool Teacher 2004-2008


  • Chippewa Valley Technical College
  • Dale Carnegie Course

Community / Volunteer

  • Volunteer & Chairperson of various committees – Rose Glen Elementary & Central Middle School
  • Waukesha West Band Booster Board Member, Vice President & President
  • Member of both You Are Special and Operation Home Baked
  • Chairperson of Caring Connection within my parish


  • Born and raised in Wisconsin
  • Currently resides in Waukesha
  • Married for 33 years with 2 sons, 1 daughter and 1 daughter-in-law
  • A Cockapoo named Hazel
  • Loves spending time as a family, enjoy baking, going to concerts, movies, and social time with friends

Here's what our customers have to say!

  • Jeff M.
    "Thank you for the very personalized and timely service. The entire process went very smoothly from beginning to end. I am very glad we selected the Thomsen team over the two other realtors we interviewed."
    Jeff M.
  • Doug N.
    Very happy to have met Tonya and her team. Would love to use them again, but I hope this is the last move!  We appreciated the little extras, like having a couple of Tonya's associates help me get the house staged for viewing.
    Doug N.
  • Mike S
    "Excellent experience as usual. From the initial listing through showings, pictures, and the overall handling of our offer to closing, service was top-notch. I have had success EVERY time I work with Tonya and her team!"
    Mike S
  • Patrice M.
    "Tonya and her team were really helpful and attentive throughout the entire process. Their patience with us... this is such a big decision and everyone was so kind and calm and very reassuring with everything."
    Patrice M.
  • Mark and Lisa B.
    Tonya is a real(ty) dynamo! She and her professional team work tirelessly and effectively to provide the best possible home buying/selling experience.  Tonya possesses such vast knowledge of the housing industry, current home valuations, local market trends, etc. We really appreciated the market-targeted price point she suggested for listing our home and how quickly it sold, not to mention the 8% premium over listing that we received!  Tonya has fantastic response times. She always replied to our emails/texts immediately or within the hour.  Tonya is absolutely fantastic and we would recommend her to everyone! The whole process was just so well ordered and classy. Thank you Tonya and your team!
    Mark and Lisa B.
  • Sharon K.
    "Selling a home you built and have lived in for almost two decades can be an emotional undertaking. This team's knowledge, expertise, and experience came in handy throughout the process. They were always responsive and ready with an answer (or a listening ear) to help us through the process. When negotiations got a little bogged down, they moved heaven and earth to make the sale happen. Everything worked out well in the end for -- and I was so happy to have them on my side of it all. I would suggest that if you are the least bit concerned about your sale, use a professional. And be sure that if you can't use this team, you find someone EXACTLY like them."
    Sharon K.
  • Zillow
    "Tonya and her team are very knowledgeable and stay on top of all the steps in buying and selling a condo. We could ask any question and get a quick and clear response. They always kept our minds at ease no matter what would come up during the process. We highly recommend Tonya and her team."
  • Scott L.
    "Tonya, Miranda, and the rest of the team are awesome. Some of the best I have worked with. I would highly recommend anyone on the Thomsen team with great confidence."
    Scott L.
  • Shelly M.
    "Always very responsive to our questions, and got us in to homes with short notice. We appreciated their honesty, patience and flexibility. Also, the knowledge of the industry and current market really paid off for us. We were very happy with our overall experience."
    Shelly M.
  • Lee L.
    "We appreciated most the communication on each step of the buying process. It made it easier for us to not have to worry about that and just focus on what home we wanted. We would absolutely recommend you guys. The whole process was smooth and easy!"
    Lee L.
  • Dwayne L.
    "The team definitely went the extra mile to make the sale easy for me.  Absolutely gets my highest recommendation."
    Dwayne L.
  • Rosanne D.
    "Very professional group of people!!  Every thing is spelled and clear so you can understand it. If you have any questions the group was right there to answer them all.  Very pleased!"
    Rosanne D.

If you are looking to buy or sell a home or would just like to know more information