Staff Members



Dr. Carol Hagen

My doctorate is in early childhood education with a minor in history. In addition to directing the Child Development Laboratory, I am a faculty member in the early childhood education program. I began my career as a public school kindergarten and first grade teacher in Wisconsin and have been directing the CDL since 1987. I enjoy traveling and I collect antique toys, especially Victorian tin tea sets.

Master Teachers


Mrs. Bridget O'Brien-Dobias

I have a B.S in Child Development and an M.S. in Early Childhood Studies from University of North Texas. I have been a Master Teacher at the CDL since 2009, and I currently teach in the three and four-year-old classroom. Working at the CDL has been a wonderful experience, and I look forward to many more years ahead.

Mrs. Karen Weidner

I have a B.S. in Early Childhood Education from UNT. I have taught preschool children for over 20 years. I have also been the director at a parent cooperative preschool program. I have been teaching at the CDL since July 2017. I enjoy working with young children and watching them grow and learn.

Mrs. Donna Cox

I have a BS in Elementary Ed and in Teaching Young Children from Stephen F. Austin as well as a MA from the University of New Mexico. I have taught in private schools, public schools and colleges in several different countries. I am passionate about working with children and sharing this passion with those that work with children. I have an amazing husband and three great young adult children. After many years of working in Africa, we relocated to Denton in early 2018. I started working at the CDL in January 2018.



Senior Administrative Specialist

Ms. Amber Brasher

Amber provides administrative support for the Child Development Laboratory.   As a part-time student, working on her Masters of Science in Clinical Mental Health Counseling on the Child Track,  and a full-time staff member, Amber has found her passion and love for learning and helping others at UNT and in the Denton community.   When away from campus, Amber cherishes her time with her husband and daughter, making art, cooking and having fun.