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AMS Leadership

AMS Impact Team

AMS Impact Leadership

Erik Greenberg, MBA

Chief Executive Officer

Erik Greenberg joined AMS in February 2019. In his capacity, Erik works closely to support AMS schools in the areas of Marketing, Enrollment, Human Resources, Talent Acquisition, Data Analytics, and Facilities. Erik has spent his entire career in education serving in various leadership capacities in both Higher Education and Early Education. He is very passionate about education, particularly providing equal opportunities for education to all students.


Prior to joining AMS, Erik served as VP of Operations for Early Education schools. He led operations for over 20 schools in various states in the Western United States. In that role, he learned how vital education is in the early years of a child’s life. Prior to that, Erik spent over a decade in Higher Education. Starting his career in enrollment services, Erik worked closely with working adults to pursue their educational aspirations. Throughout his time, he led larger enrollment teams and eventually lead entire campus teams serving as Campus President in both Washington D.C. and Dallas, Texas.


Erik has a bachelor’s degree in International Business and a Master’s in Business Administration.

Brandi Adams Bressler

Chief Operating Officer

Brandi Adams Bressler joined AMS nearly 2 years ago and has served as the VP of Enrollment and Data Compliance. Since coming to AMS, Brandi has made a significant impact on improving many aspects of our enrollment processes and policies. Additionally, she has created procedures to ensure clean and accurate student data for AMS records and at the state level. These procedures have led to dramatic improvements in student data being shared with the state and putting AMS is a very compliant place.


Brandi has spent her entire career in education. With a Bachelor of Science in Secondary Education and a Master of Educational Leadership, Brandi began her career as a high school history teacher. She held instructional leadership roles, and school administrative roles before transitioning to various operational roles with a charter school network in Arizona. Brandi is very passionate about education and the work we do to provide it to the communities we serve.


In her role, Brandi will work closely with the Network’s Operations Teams, partner with Nate to execute high performing and operating schools, and will serve as a member of the executive leadership team.

Steven Hykes, BS, CPA

Chief Financial Officer

Steven Hykes graduated with a Bachelor of Science from the University of Akron with a minor in Economics. He began his career in public accounting working in the fields of audit, tax and mergers and acquisitions for both Deloitte and PricewaterhouseCoopers. Steven received his Certified Public Accounting license from the state of Arizona in April of 2015. He has a diverse background having managed restaurants, volunteered overseas, and done both educational and non-profit work. Most recently he was the Chief Financial Officer of United Way of Tucson and Southern Arizona, where he spent three years overseeing various financial aspects of the business. Steven joined the AMS network in January of 2016.

Nate Lowry

Chief Academic Officer

Prior to joining AMS, Nate Lowry was an Executive Director for IDEA Public Schools in the Greater Austin area, where he oversaw 16 high performing schools serving almost 10,000 scholars K-12 all in high poverty neighborhoods. As Executive Director, he achieved 100% matriculation for their senior classes, and he led the region to increased performance on state assessments, leader and teacher retention, and scholar persistence.


Before managing the entire Austin Region, Nate served as a Vice President of Schools for IDEA, where he significantly increased principal retention, helped orchestrate school turnaround, and set strategy for program and talent development. Serving as IDEA Public School’s VP of Leadership Development, he designed and implemented school leader training for a network of over 70,000 scholars across multiple states. He was the founding principal of IDEA Weslaco Pike winning recognition at the state and network level for high levels of scholar achievement, and during his tenure as campus principal, Nate led IDEA Montopolis College Preparatory to be the only school in east Austin to earn a TEA “A” Rating in 2018.


Nate is a proud Cornell University graduate, and also holds a Master’s Degree in Educational Leadership from Columbia. He strongly believes in holding all students and adults to high expectations, and is focused on finding innovative programming that closes the experience gap for all students .

Robert Biggs

Chief Information Officer

Robert Biggs is the Chief Information Officer for AMS. His career started in the Department of Entomology at the University of Arizona where he studied the effects of genetically modified crops insect pest populations. After gaining an interest in Information Technology while building IT tools to manage data collection and presentation at the U of A, Mr. Biggs transitioned to a career in technology. Throughout his career he has managed many IT implementation projects that touch on a wide varieties of technologies including networking, server systems, communications, line-of-business applications (EHR, CRM), and cloud solutions. He has built and managed teams of IT professionals, emphasizing skill-building and career progression. He has provided CIO services to many for-profit and non-profit organizations in various verticals including Medical, Public Safety, Education, Retail and Government. Mr. Biggs joined AMS in September 2017.

Šárka White

Director of Schools

Šárka’s almost 3 decades of experience in education have earned her several honors including the Teacher of the Year award in 1998, 1999, 2001, the NASA innovative Science Leadership Award in 2001, and USDA and Wyoming’s State/National educational leader award in 2007. Before serving as Regional Director of Schools, Šárka served as Human Resource Director for Winslow Unified School District, Curriculum Manager for StrongMind, Director of Research, Data, and Development for KUSD, Education Director for Wyoming Dept. of Agriculture and USDA, Trainer, Elementary, Middle and High School Principal, Dean of Students, College Faculty and Teacher. She has trained and coached over 10,000 teachers and leaders, who have all gone on to lead dynamic schools nationally and internationally. She started her career in education as an international Kindergarten and High School American Economics teacher in Linguistics school Moscow #1157 and then as an International Baccalaureate Science teacher in Colorado. Additionally, she engaged in work of school innovation through RELAY Graduate School of Education in 2017 where she worked with her own school community and larger network to improve education for all scholars. She earned her B.A. in Education from University of Wyoming and M.Ed. And Ed.D/CI in educational leadership and curriculum and Instruction.

Dr. Andre Haughton

Regional Director of Schools

Before joining the Academies of Math and Science in June 2022, Dr. Haughton has spent over a decade working to improve the lives of students in Texas and California through enhanced educational opportunities. 


After earning a Bachelor of Sciences degree in Political Science from the University of Florida in 2010, he began his career as a Teach For America corps member teaching 8th grade social studies in Houston, Texas. Over the next several years he continued to teach while earning a Master of Education degree from the University of St. Thomas and dedicating his summers to training new teachers through Teach For America’s summer institute as well as veteran teachers with the Houston Independent School District. Over the next few years Dr. Haughton won the coveted Kinder Award for Excellence in Teaching in Houston (2015), became an assistant principal (2016), and earned a Doctorate in Education from the University of Houston (2017). Since then, he has continued to train new teachers as a professor with the Relay Graduate School of Education and Houston Community College while also being a principal-in-residence in Austin, Texas and then school principal in Oakland, California.


Throughout his career, Dr. Haughton has now taught over 800 students, been a leader for over 2,500 students, and coached/supported over 500 teachers, many of whom have gone on to lead schools of their own.  

Josh Duerr

Regional Director
of Operations

Josh has a dynamic blend of operations and education experience. For the past 6 years, he served as the Executive Director of a multi-site church in North Phoenix where he oversaw the operations, finances, and facilities of each of the church’s campuses. Josh also led their strategic planning and data analysis for the expansion efforts for each of the new campuses across the Valley.


Prior to serving as the Executive Director, Josh worked in a charter school network in South Phoenix for 6 years, where he taught middle school math and science and served two years as the Dean of Students. Josh has a Master’s in Business Administration, a Master’s in Educational Leadership, and a Bachelor’s of Science in Elementary Education.

Tammy Oluyemi

Vice President of
Talent Development

With two decades of educational leadership experience, Tammy Oluyemi’s service has resulted in closing achievement gaps and creating opportunities for students in Louisiana, Georgia, Washington D.C., Texas, and Illinois. She has a record of results positively impacting urban communities where resources and access are limited, as well as developing leaders into high performers with a runway ranging from 6 months to 1 year.

Prior to joining AMS, Tammy Oluyemi was the Officer of Teacher Advancement with Harris County Department of Education, providing support to 25 school districts in the Greater Houston area. In this role, Tammy designed and executed on customized leader coaching plans and developed year-long programs to increase skill and capacity in school leaders resulting in superior outcomes for kids. Prior to that, Tammy served as the Managing Director of Leadership Development with IDEA Public Schools where she was a part of a leadership team that successfully launched an “A” rated region. In addition to regional and school district leadership, Tammy’s experiences include being a K-12 school leader, professional development designer and facilitator, Common Core and State Standards implementation manager, curriculum writer, instructional coach, and teacher in traditional public schools and public charter schools.

Tammy was a USDA scholar at Southern University and A&M Colleges where she earned a bachelor’s degree in Animal Sciences. She completed the teacher certification program at Nicholls State University, then earned both master’s and educational specialist degrees (Ed.S.) from Nova Southeastern University in Curriculum, Instruction, & Technology Administration. She completed the National Principal Academy Fellowship (NAPF) with distinction from Relay Graduate School of Education. Mrs. Oluyemi has been rewarded for high performance throughout her career because of her unwavering high bar of excellence for herself and those she serves.


Natalie Trainor

Director Exceptional
Student Services

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Emily Willis

Director of
Human Resources


Craig Peterson

Director of Talent


Blanca Payne

Director of Curriculum
and Instruction


Caylee Migliorini

Vice President of Marketing


LaShawna Cox

Principal – AMS Avondale


Jeremy St. Germain

Principal – AMS Camelback


MeLisa Thalacker

Principal – AMS Desert Sky


Curtis Walker

Principal – AMS Flower


Caitlin Sims

Principal – AMS Glendale


Norma Derby

Principal – MASSA



Kristina Winters

Principal – AMS Peoria Advanced



Sandra Lomeland

Principal – AMS Prince


Gustavo Baptista

Principal – AMS South Mountain


John Paquin

Principal – Advanced Virtual Academy

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