Walnut High School

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Leadership Team

 Dr. Ryan Maine - Principal  
Dr. Ryan Maine starts his fourteenth year in education and second year as Principal at Walnut High School. Prior to Walnut High School, he was an Assistant Principal at Santiago High School in the Corona-Norco Unified School District for three years overseeing Math, CTE, Visual Arts, Performing Arts, Educational Technology, Student Discipline and Safety, Dual Enrollment, and AVID. He was a Social Science and video production teacher at Santiago High School and Diamond Bar High School for nine years. 
Dr. Maine was born and raised in the Walnut Valley Community where he went on to receive his Bachelor’s Degree in Communication Studies from the University of San Diego, his Master’s Degree in Educational Administration from Grand Canyon University, and recently completed his Doctorate from Azusa Pacific University in Educational Leadership. Dr. Maine’s dissertation focused on leadership attributes that lead to high levels of student connectedness on a high school campus. School connection is the belief by students that adults in the school care about their learning and about them as individuals, which is what Dr. Maine tries to foster at Walnut High School every day. 
Dr. Maine is married to his amazing wife of 11 years, Lindsay. They have three children, five-year-old twins and a one-year-old as well as a pretty cool golden retriever, Oakley. 
Dr. Andrea Poma - Assistant Principal
Dr. Andrea Poma begins her first year as Assistant Principal at Walnut High School. She has spent the last 13 years in the field of education, teaching all levels of High School English, English Language Development (ELD), and Various Intervention Courses. She has served in various other capacities including ELD coordinator, Intervention/RTI committee member, Anti-Bullying and Positive Behavior Advisor, and Grade Level curriculum and Instruction lead.
Dr. Poma received a Bachelor of Arts Degree in Theatre Arts from California State University Long Beach; Two Masters Degrees, one in Education, the other Educational Leadership, from Azusa Pacific University; and a doctorate in Educational Leadership, with an emphasis in Educational Psychology, from the University of Southern California (Fight On!).
Her educational philosophy is based on the uncompromising belief that all students can learn at high levels, and is committed to providing culturally relevant, equitable opportunities for every student to succeed. She attributes her continued growth as an educator to her role as a mother to her ten-year-old daughter Kendall.
Dr. Poma considers it an honor and a privilege to have been selected to join the Mustang family. She is ready to immerse herself in “the Walnut Way” and to contribute to a school and district with a strong reputation for putting kids first, every student, every day. 
Barbie Cole - Instructional Dean of Math, Science, PE, & Health
Barbie Cole begins her 34 th year at Walnut High School, 25 th as the Instructional Dean of Math, Science, Physical Education and Health. Prior to Walnut High School she taught science for one year in Missouri and three years in Texas. During her 34 years at Walnut High School she has taught Life Science, Biology, Biology Honors, AP Biology and Forensics. In addition she was the Cheer advisor for nine years. Her love of teaching goes beyond the classroom doors and hopes to instill this within all of her teachers to provide the best education possible for our students.
Barbie holds a Bachelor of Science degree in Education with a major in Biology from the University of Missouri-Columbia and a master’s degree in Education Administration from Azusa Pacific University.
She has been married to her husband Randy for 37 years and has two children, daughter Meghan and son Hunter both proud graduates of Walnut High School. She also has three grandchildren, two grandsons and a granddaughter. Barbie enjoys traveling with her husband in their motor coach and spending quality time with her family.
Marta Dibell - Instructional Dean of World Languages, Performing Arts, Visual Arts, Special Education
Marta Dibell joined the Walnut family in 1992. She is proud to lead the Special Programs team and work with parents and teachers to ensure their students have a positive educational experience and are able to attain their goals. Marta believes her well rounded teaching experience gives her a unique perspective of the needs of students and teachers.
During her 28 year tenure at WHS, she has had the pleasure of teaching German, French, English, ELD, PE, and has served as the ELD Coordinator and District ELD Program Specialist. She enjoys teaching beginning language levels the most, and strives to inspire a love of learning about different languages and cultures.
Marta holds a bachelor’s degree in German from The Florida State University and a master’s degree in Language Development from Azusa Pacific University.
Away from school, Marta lives with her son (a WHS graduate!) and two dogs. She enjoys traveling, learning about new cultures, and trying new food. A Cordon Bleu trained chef, Marta enjoys spending her free time in the kitchen happily planning and preparing meals for her friends and family.
Nelson Chen - Instructional Dean of English, Social Science, CTE, Dual Enrollment
Mr. Chen starts his fourteenth year at Walnut High School, and fourth year as Instructional Dean for English, Social Science, Career Technical Education, and Dual Enrollment. He previously served as Walnut’s certified athletic trainer, and passionately taught Sports Medicine for nine years.
Prior to Walnut High School, he worked at Woodbridge High School in Irvine. Nelson received his Bachelor of Science degree in Kinesiology from Cal Poly Pomona in 2005, and his Masters degree in Athletic Training from the University of Hawaii in 2007. He achieved his single subject credential in career technical education (CTE) and began teaching in 2008.
In 2019, he earned his second Masters in Educational Leadership and Administration from Brandman University, and is now enrolled in UCLA’s Leadership Support Program (LSP).
He is married to his beautiful wife Vanessa, who is a certified athletic trainer at Garey High School, and a CTE teacher at Walnut High School. He and his wife have two beautiful cats, Lewis and Lorelei. 
Conchita Cawley - Operations Manager
Mrs. Cawley is excited to begin her second year as School Operations Manager and seventh year as a Walnut Valley Unified parent. She joins us with more than 20 years of experience in the private sector in leadership and management.
Prior to Walnut High School, Mrs. Cawley worked at a non-profit mental hospital in downtown Los Angeles as the IT Manager. She was the sole on-site IT employee supporting 400+ employees. She worked at Nordstrom full line stores in Costa Mesa, Brea, Cerritos and Montclair as well as the Nordstrom Rack in Costa Mesa. Mrs. Cawley began her career on the sales floor and quickly worked her way into Customer Service Management. She was honored with the prestigious Customer Service All- Star award.
Mrs. Cawley received her Bachelor of Arts degree from California State University, Fullerton in 2002.
She serves on the board for Diamond Bar AYSO. She enjoys volunteering in her children’s’ classrooms and also in Children’s Services at her church in Chino Hills.
She has been married to her husband, Richard, for 15 years. They have three children (7th grade, 3rd grade and 1st grade).
She is a proud Walnut High Mustang, Chaparral Middle School Cougar and Castle Rock Elementary School Knight.
Andy Schultz - Activities Director
Andy begins his 22 nd year at Walnut High School. He spent his first 8 years teaching Chemistry and coaching basketball. During this time, he was selected as a Los Angeles County Most Inspirational Teacher of the Year two times as well as the Walnut High School Teacher of the Year. For the past 14 years, he has been the Mustang Activities Director.
Prior to Walnut High School, Andy taught Chemistry and Biology as well as well as being a head boys’ basketball coach in the state of Washington for nine years. He attended Washington State University before earning his degree in Biology and Chemistry from Carroll College in Helena, Montana. He is married to his beautiful wife, Corolar Schultz, who is a Grade Level Coordinator at Walnut High School.
Andy grew up on the Schultz and Sons’ Black Angus Ranch and Wheat Farm in Eastern Washington. His childhood established the importance of planting seeds and having the patience to let them grow. On a daily basis, Andy plants seeds of empowerment into his students and has had the pleasure of taking part in both their growth and maturity.
Jerry Person - Athletic Director
Jerry begins his 23rd year at Walnut High School. He spent his first eight years as the Head Varsity Football Coach. The last 15 years as a Freshmen Football Coach. He earned LA Times area coach of the year 3 different times. He is in his 21st year as the Walnut High School Athletic Director. He was honored with the CIF Southern Section Athletic Director of the Year Award in 2012 at the CSADA Conference. Jerry teaches Kinesiology at Walnut High School.
Prior to coming to Walnut High School, he taught and coached for nine years at Saint John Bosco High School, two years at Servite High School, three years at Pius X High School and one year at Alemany High School. He earned his Undergraduate Degree at San Diego State University where he was on an athletic scholarship as a member of the Aztec Football Team (AFL). Jerry earned his Teaching Credential from Long Beach State University and his Masters Degree in Education from Azusa Pacific University.
He loves to spend time with family, camping, hiking, playing games and being an amateur pit master. Jerry resides in Fullerton with his Wife Lori and has two daughters Brittany Ann Person Valdez (Physical Therapist) and Bree Nicole Person Costello (Teacher).
"Leadership isn't about getting your own way, it's about helping others find theirs." Unknown
Kevin Wendland - Instructional Technology Coach
Mr. Wendland begins his 17th year in education and his second year as Instructional Technology Coach for Walnut High School. Before becoming the school's technology coach, Mr. Wendland was a teacher in the Math department where he taught different levels of math from Pre-Algebra to Math Analysis.
Mr. Wendland received his Bachelor of Science degree in Mathematics from California State University, Fullerton in 2000 and a Masters of Arts in teaching from the University of La Verne in 2004. 
Mr. Wendland met his wife in class here, at WHS, when they were students here. They have 2 wonderful children, 2 cats, and a dog.
Monique Estrada - Administrative Assistant
Monique Estrada begins her 10th year in education and excited to start her 6th year at Walnut High School. Before joining Walnut High School, Monique worked as the Administrative Assistant in the Special Education Department for Pasadena Unified School District.
Monique completed her Bachelor of Science degree in Sociology at Cal Poly Pomona. Monique grew up in the Walnut Valley Community. Monique is a Chaparral Middle School and Diamond Bar High School alumni!
In her spare time, Monique enjoys spending time with her family, exploring the beautiful oceans and mountains of California.