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.

Allison Zacharias – District Special Education Director

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.


NIAA Gibbins Administration

Mr. Jay Tinklenberg – High 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. 


NIA Cedar Hill Administration

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.


Holly Temte – Elementary School 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

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 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