Kathleen Zimmermann

Executive Director


Kathleen Zimmermann became the Executive Director of NYOS Charter School in 2009.  Before joining NYOS, Kathleen spent many years in education, operations, and financial management roles.  Kathleen holds a Masters in Business Administration from Harvard Business School and a Bachelor of Science degree from Georgetown University in Washington, D.C.

Julie Atchley
Director of Academics


Julie Atchley joined NYOS in 2005 and served as the middle school/high school principal for seven years. She has more than 25 years of experience in education -- 19 years in administrative leadership.  She holds a Master’s degree in Educational Administration from Texas State University and a Bachelor of Science degree in Education from Oklahoma State University.

Joey Thompson, CISSP

Director of Operations


Joey Thompson joined NYOS Charter School in 2007 as the Middle School Technology Applications teacher. Then in 2008 moved into the Director of Technology position, drawing on 10+ years of experience designing, installing, and managing networks from the ground up. Joey has held several certifications over the years, including the most recent CISSP and CompTIA Network+ certifications. In the summer of 2017, Joey began leveraging experience in construction and facilities work along with safety and security to further benefit NYOS as the Director of Operations.

Hweilu Chen, CPA
Director of Finance

Hweilu Chen joined NYOS in 2011 and has served as the Senior Accountant for the past 6 years. In the fall of 2017, she was advanced into the Director of Finance position to oversee Accounting, Human Resources, Registrar, Community Outreach, and Grants.  Hweilu holds a Master’s degree in Professional Accounting and Bachelor in Business Administration in Accounting from The University of Texas at Austin.

Terry Berkenhoff
Elementary Principal


Terry Berkenhoff joined the NYOS Charter School community in 2007 as the Elementary Principal.  Throughout her professional career she has served in a variety of roles including classroom teacher, curriculum specialist, assistant principal and principal.  She holds a Master’s degree in Educational Administration from Concordia University, Austin and a Bachelor of Science degree in Curriculum and Instruction from Texas A&M University.

Will Jaramillo
Secondary Principal


Will Jaramillo joined the NYOS Charter School community in June of 2019 as the Secondary Principal. Prior to this role, he served as an assistant principal, a summer principal, an instructional coach, a curriculum writer, and a classroom teacher. Will earned a Master of Education in School Leadership from Harvard University and a Bachelor of Arts in Mathematics from St. Edward's University.