​​​​Phone: 817.557.7520

DEBBY RIORDAN, Emeritus Founding Member

Mrs. Riordan was one of the four women who founded Southlake Montessori in 2014 and served as its Head of School through the 2017-2018 school year.  Currently, she serves as the Executive Director of AMI/USA. Mrs. Riordan has a Master's degree in Developmental Psychology, a Bachelor's degree in Psychology, her AMI Montessori Elementary diploma and, most importantly, has witnessed the gift of Montessori education in her four children.

Board of DirectorS


Robin Nagengast has been committed to participation in AMI Montessori programs since her eldest daughter began school in 2008.  She and her husband have four children; the two oldest completed seven years of AMI Montessori education before moving into the public school, and the two youngest are members of the Southlake Montessori community.  Robin has dedicated herself to the enrichment of children throughout her work experiences which include Kindermusik instructor, Director of Children's Ministry at her church, as well as part-time as Program Assistant at Southlake Montessori.  In addition to her domestic efforts, Robin also is a child sponsorship advocate and travels to Lira, Uganda, annually with Children of the Nations whose vision is "Raising Children Who Transform Nations." She has a BBA and an MBA in Finance and previously worked for Fidelity Investments.

CRISTINA P. SCOTT,Board President

Cristina Scott has been an AMI Montessori school Board Member in the past and is a longtime proponent of the Montessori philosophy.  Her daughter was a Montessori child for seven years, which further entrenched the philosophy in the Scott family.  Cristina has built a career in international sales and account management in the travel industry.  She has an International MBA and today she runs the Latin American Supplier Commerce Division at Sabre, Inc..  Her philanthropic work includes initiatives for Amnesty International, The Make-a-Wish Foundation, and the fight to end Human Trafficking.  She is excited to take this opportunity to serve on the Board of Southlake Montessori and bring the Montessori philosophy back to the children of Southlake and the surrounding communities.


Bonnie Hamilton was first introduced to Montessori education as a parent.  Both of her daughters have attended an AMI Montessori school since the beginning of their educations, and Bonnie assisted in a Lower Elementary Montessori classroom for two years.  She has seen firsthand what a Montessori environment can do to foster the love of learning as well as a sense of community in a child.  Bonnie has a BBA in International Business and Business Broadcasting from the Hankamer School of Business at Baylor University.  In addition to her time as  Montessori Assistant, Bonnie has spent most of her career in the financial services industry.  Bonnie is very excited to be a Founding Board Member for Southlake Montessori.