Mrs. Karen Siggeman-Lead Teacher


Mrs. Siggeman comes to us after 18 years in the Chicago Archdiocese​. She is passionate about preschool yet has experience in PK and elementary. She has a strong belief in the mission of a Catholic School to nurture her students' growth in their Catholic Faith and to foster their relationship with Jesus.


Mrs. Sherri Simms- 4 year old teacher


I am truly blessed to be part of the St. Thomas Little Saints Preschool family.  This is my fourteenth year at St. Thomas School.  I have been with the preschool department since we proudly began in 2008. I have 21 years of experience in Early Childhood Education. I am especially passionate about phonics and early literacy. Growing up, I was blessed to call Crystal Lake my hometown. My husband Brian and I have been married for 32 years.  We have three wonderful boys, Kyle 27, Bradley 24, and Jacob 14.  In addition, I am the grandmother to a beautiful five-year-old granddaughter, Adilynn.  We are proud members of St. Thomas the Apostle Parish.  Our son Jacob graduated from St. Thomas School in the spring and is now a freshman at Prairie Ridge High School.  I am really excited for another wonderful year at St. Thomas Little Saints Preschool.  God Bless!!!!


Mrs. Jerri Mazurk, PK Founder & Mentor


This is my eleventh year as a teacher with St. Thomas Catholic School and Little Saints Preschool.  I have been in Early Childhood Education for 28 years, including being a director and owner of my own preschool.  I am a firm believer of continuing education and have received my Illinois Director Credential. I hope to facilitate a classroom environment that encourages creativity, hands on experiences, self-confidence and a joy for learning, with God as the center of all that we do.  It is my goal to maintain open communication with all of our parents and families.  I reside in Crystal Lake with my husband, and I am the proud mother of three grown children, a daughter in-law, a son-in -law and four beautiful grandchildren.  I have a passion for creativity, so if I am not making fun school activities, or finding new decorating ideas, you will find me Quilting!


Mrs. Catherine Dovidio, PK co-teacher

Mrs. Dovidio is an experienced elementary school teacher that has taken some time off to be a stay at home mom with 4 children of her own, all of which are students at St. Thomas or an alum of STS!

She considers the mission of a Catholic school to be to reach all students at all levels and to help them grow, academically, spiritually, and physically. To focus on the whole student, including all aspects of their development. She is looking forward to sharing her faith and  experiences as well as teaching the students to put God above all else by praying and trusting in God, including being open to God’s plan for us.