District Leadership

Dr. Sheba K. George – Superintendent and CEO
Dr. Sheba K George

Dr. Sheba K. George is the founder of Newman International Academy of Arlington. She and her family worked to have a charter school in their community because they realized the need for a safe haven with a private school nurture and rigor that can cater to students of all economic levels, especially those children who cannot afford private school fees. Dr. George’s passion is to see generations of children in America rise up to have and fulfill great dreams. She is committed to seeing children of our nation meet the demands of the world marketplace in all fields including science, technology, engineering (especially aerospace, and computer engineering), mathematics, literature, writing, law, journalism, fine arts and sports.

According to Dr. George, “excellence can be achieved in all fields by sowing seeds of knowledge, ‘conceptual understanding,’ ‘procedural fluency,’ ‘strategic competence’ and problem solving skills in the soil of America’s unsurpassable creativity. These seeds can grow to see success only in an environment of nurture, care, hard work, and discipline. One must always remember that true success and good character are inseparable.” Dr. George also believes that “every child has some gift, and the school partnership with parents and community can help every child reach his or her highest potential. ’No child’ should be ‘left behind.’ ”


Mrs. Betty Sims – Assistant Superintendent
Betty Sims

Mrs. Betty Sims is a native of Seattle, Washington and graduated from the University of Washington with a BA in Speech and Hearing Pathology. She also received training as a Language Therapist and Specialized Reading Teacher working with children with Dyslexia and other reading related challenges.

Mrs. Sims served 22 years in Christian and public education as a teacher and principal, with a focus in charter school education. She resides in Arlington and is married with two children and five grandchildren.


Chiquita Hartfield – District Special Education Director

Picture of Chiquita Hartfield

Mrs. Hartfield has been in education since 2002. She received her Bachelor of Science degree from Texas A&M University in College Station, Texas and her Master of Education was earned from South Western Assemblies of God University in Waxahachie, Texas.  Mrs. Hartfield is certified in EC-12 Special Education and has over 15 years of experience working with Special Education students. Her experiences were gained working with EC-12 Special Education students in diverse populations in the private schools, public schools, and charter schools environments. Ms. Hartfield is rewarded by the accomplishments of ensuring the individual success of each of her students and seeing that their unique needs are met in order to reach their highest potential. She is passionate and committed to providing appropriate educational opportunities to students with special learning needs.


NIA Gibbins Administration

Donna Hart – Secondary Principal
Donna Hart

Mrs. Donna Hart has been an educational leader since 1977. She received her Bachelor of Fine Arts with a certification to teach All Level Art from UT Arlington. Her Master of Education in Leadership was earned from Dallas Baptist University, with a certification for the Principalship, K-12. Mrs. Hart has pioneered and led multiple schools, but has never been more fulfilled than she is at NIAA! She is passionate to see transformation in the lives of her secondary students, and she is committed to helping each of them become successful adults who fulfill their purpose in life.


NIA Arlington Administration


Kristen Stock – Elementary Assistant Principal
picture of Kristen Stock

Kristen Stock completed her undergraduate work in 2003 at the University of Texas at Arlington, earning a Bachelor of Arts in English. In 2014, she received her Master’s Degree in Educational Administration from Concordia University in Austin. During her career, she has been a teacher in the elementary and middle school levels and been an administrator at the elementary and middle school levels also.



NIA Pioneer Administration

Mr. Jay Tinklenberg – Middle School Principal
Jay Tinklenberg

Jay Tinklenberg began serving students as a counselor, teacher, and coach in 1987.  Mr. Tinklenberg earned a BA from Calvin College in History and Secondary Education and an MS from South Dakota State University in Counseling and Human Resource Development with an emphasis in School Administration.   Over the course of his career, Mr. Tinklenberg has served in instruction, leadership, counseling, and coaching in three states and four different schools. 


Carinia Hornbuckle – Middle School Assistant Principal
Carinia Hornbuckle

Mrs. Carinia Hornbuckle is a graduate of Grambling State University with a Bachelor of Science degree in Elementary Education, and her Masters of Educational Leadership from Dallas Baptist University pursuing a Principal certification. With many years of teaching experience and over 15 years of mentorship, Mrs. Hornbuckle has a passion for teaching life lessons as well as academics. Her hobbies include singing, traveling, and motivational speaking. Prior to joining the Newman family, Mrs. Hornbuckle toured with Gospel Recording Artist Kirk Franklin on the Hopeville Tour. Having three children attending Newman International Academy, she is fully invested in the vision of raising Warriors of wisdom, stature, and favor.


Mr. Jayson Lewis – Middle School Assistant to the Principal
Jayson Lewis

Jayson "Coach" Lewis has been involved in education since 2006. He holds a B.A.I.S. in Math and Science Studies for Adolescent Learners as well as his Master of Education in Leadership and Policy Studies both earned from UT Arlington (GO MAVS!!). Mr. Lewis is humbled by the opportunity to work with the students, families, and staff of multiple Newman International Academy campuses. He only hopes that he has made as big of an impact on each of their lives as they have on his.


NIA Cedar Hill Administration


Stephanie White-Robinson – Assistant to the Principal
picture of stephanie robinson

Mrs. Stephanie White-Robinson was born and raised in Dallas, TX. Upon graduating from South Oak Cliff High School, she served in the United States Navy as an Engineman. She received her Bachelor of Arts in Criminology from UTA. She holds a Master of Education in Curriculum and Instruction and a Master of Education in Educational Administration.

She has volunteered and sponsored a Girl Scout Troop for many years. She is currently volunteering with the Boy Scouts. She is dedicated to helping students become productive adults who will make a positive influence on the world. In her free time, she loves to spend time with her family.


Holly Temte – Assistant Principal
picture of Holly Temte

Mrs. Holly Temte graduated from Christ for the Nations Institute, Southwestern Assemblies of God University, and University of Texas at Arlington. She has almost ten years of classroom teaching experience, over 25 years of pastoral experience, and has been an elementary assistant principal for two years. Married for over 30 years to Joe Temte, she has two children and enjoys collecting Talavera pottery, making Ukrainian eggs, and boating with family and friends.


NIA Grace Administration



NIA Fort Worth Administration

Dale Duncan – Elementary Principal
Picture of Dale Duncan

Mrs. Dale Duncan earned a Bachelor of Science from Texas Christian University in 1998. She earned her M.E.D in Educational Leadership with an emphasis in Dual Language Education from the University of Texas at Arlington in 2010. Mrs. Duncan believes in providing students the opportunity to learn in an environment that is safe and promotes excellence. Mrs. Duncan taught at Sam Houston High School in Arlington ISD from 2003- 2015. Mrs. Duncan served as assistant principal at Newman Academy of Arlington and currently serves as principal at Newman Academy of Ft. Worth Elementary school.


NIA Mansfield Administration