Faculty & Staff

Suzi joined the staff at Headlands after 13 years in administrative support with the Mill Valley School District. She is a Bay Area native who raised her two children in Marin and relies on her own experience as a parent to support students and families. Suzi holds a B.A. in English from UC Davis, a J.D. from McGeorge School of Law, and has completed certificate programs in human resources law and DEI in the workplace.

Suzi Andrews —  School Operations Coordinator
Tim graduated from UC Davis with a B.A. in Economics and a minor in History. He has experience in data analytics, as well as over seven years of experience teaching and tutoring. Tim has worked with a broad array of students, from elementary-aged students practicing their reading skills to professionals brushing up on their math to pass professional certification tests. He has a lot of experience working with high school students, and he enjoys working closely with students to tailor his lessons to their specific needs. In his free time, Tim enjoys reading, writing, programming, being outside, and watching the Warriors.
Tim Bearden — Math Department Chair, Math, Science, History, Social Science
Born and raised in a suburban town of Los Angeles, Nicole had influential high school teachers who sparked a joy within her for history and writing. This led Nicole to earn a B.A. in History with a minor in Journalism from San Francisco State University in 2019. Nicole has a deep love for travel – she has lived in Bali, Indonesia, and has backpacked through Europe and Iceland. Throughout college and her travels, Nicole grew passionate about writing, education, diversity, and all things multicultural. In her free time, Nicole enjoys yoga, boxing, and cooking.
Nicole Cadavona — English, History, Math

Liz Cosentino has been teaching and tutoring all ages and subjects, including Spanish, Italian, and French, since 2005. She earned a Master's Degree in teaching Romance languages from Stony Brook University in New York and has taught kindergarten through college as well as adults looking to further their education or conversational skills in world languages. When not teaching, Liz studies psychology and loves drawing, art/music (including singing as well as playing the didgeridoo and harmonium), hiking, yoga, meditation, traveling, and board games. Liz also enjoys spending time and connecting with friends, family, and her two children, ages 5 and 7.

Liz Cosentino — World Languages
Lifelong passions for language, culture, and literature along with a natural affinity for teaching led Laurel to pursue her master's degree in Teaching English to Speakers of Other Languages, and, once earned in 2012, propelled her on an exciting journey to rural Thailand, where she taught, developed curriculum, trained teachers, and co-wrote a textbook. In 2015, she returned to the states and spent 6+ years teaching and developing curriculum as a full-time faculty member at the University of Southern California. Laurel is quick to point out that her academic success is in no way reflective of her performance in grade school. Challenges in her environment took away her confidence and led Laurel to believe that she didn't like teachers or school; but to quote Louise Penny, one of her favorite modern authors, "things are strongest where they are broken," and Laurel is convinced that her struggles as a student are now a precious resource to her skills as an educator. In her free time, Laurel enjoys portraiture, reading, writing, singing, playing guitar, yoga, mindfulness meditation, learning languages, cooking, dancing, hiking, backpacking, and doing absolutely anything with her poodle-mix, Daisy. She has traveled to more than 15 countries and has spent more than one month in Japan, Italy, Korea (6 months), and Thailand (2.5 years).
Laurel Costill — English, History, Math, Mandarin
Recovering from an inability to sit still and be quiet in class, Jim managed to enter the University of Florida’s Invitational Honors Program and eventually graduate with a BA. He went on to do lab tech work for USDA and then earned a Primary Certification from the AMI, Montessori’s international organization. Jim mixed teaching in private and public schools with tutoring and subbing as well as jobs for fun, like soda jerk, movie usher, and professional magician. Jim has a Masters in Education from Dominican, and certifications in Math and Science. He prefers working with students one-to-one, in partnership. He also paints and creates bonsai.
Jim Fish — Math, Science
Jordan was born and raised in Sacramento, California, and graduated from UCLA in 2019 with a B.A. in political science. Shortly after graduation, he moved to Buenos Aires to teach English as a foreign language. He is excited to continue his journey in education here at Headlands Prep. In his free time, he enjoys chess, studying music, playing video games and board games, and playing with his baby kitten, Mombo.
Jordan Fox — English, History
Eden Frazee graduated from the University of California, Santa Cruz with a BA in the History of Art and Visual Culture in 2015. While in college, she was able to explore her academic love for the arts, writing, and even ecological sustainability, on which she facilitated a student-led course. Eden is deeply curious about alternative forms of education and has instructed in a variety of environments, including teaching Yoga and Mindfulness, leading classes for grades pre-K-8 at an educational summer camp, and doing private tutoring. She is dedicated to learning from her students, always remaining curious about how they may best grow and face challenges confidently. Her passions include art and creative pursuits, social justice, mental health, mindfulness, and self-expression. When not at school, you can expect Eden to be cooking up a vegan feast, hiking around the hills of the Bay, experimenting with arts and crafts, or exploring local museums and galleries.
Eden Frazee — English, History, Math, Art
Born in San Francisco, but raised in Philadelphia and Omaha, David has a B.A. in English with minors in Philosophy and Religion from Gustavus Adolphus College in St. Peter, Minnesota. David has taught preschool, elementary, middle, and high school in public, private, and charter schools throughout the Bay Area, working with students in general education, special needs students, and gifted populations. Additionally, David has also tutored extensively, done CAHSEE and SAT prep, taught STEM courses for middle schoolers, and helped aspiring teachers pass CSET and CBEST tests. David’s greatest academic joy is teaching history. Among his many pursuits, David enjoys meditation, hiking, exercise, playing guitar, songwriting and recording and he performs throughout the Bay Area and beyond.
David Goodlett — English, History
Sara received her B.S. in 2019 and has been living and working in the Bay Area ever since. Looking for a change of pace, she has recently found herself immersed in the special community that is Headlands Preparatory School. In her free time, she loves spending time outside and cooking.
Sara Hakala — Administrative Assistant, Student Services
Sebastián was born and raised in Santiago, Chile, but lived in the Bay Area as a child during the early '90s. He received his B.S. in Geology from Universidad de Chile, where he also got his Ph.D. in Earth Sciences, specializing in geologic and geodynamic processes that led to the formation of the Andes mountains. Sebastián has worked as a Teaching Assistant at Universidad de Chile and as a Research Intern at Yale University, and for many years has been a Math, Science, and Spanish tutor for middle and high schoolers. He believes that combining theory with practice and experience is fundamental in every learning process. He is happy that life led him back to the Bay Area, where he enjoys mountain biking, hiking with his family, collecting graphic novels, and exploring the wilderness.
Sebastián Herrera— Math, Science
Aron was born and raised in Oakland, California. He received his Bachelor of Sciences in Marine Biology from the University of California, Santa Cruz. Since then, he has occupied a variety of educational roles in both outdoor and classroom settings with people of all ages and backgrounds. He has worked as a scientific diver for NOAA, a kayak guide in Monterey Bay and the San Juan Islands, a professional team-builder for companies in the Silicon Valley, a marine science teacher for middle school and high school students, and most recently, partnering with Americorps to teach math at his old Middle School in Oakland. Aron believes that fostering curiosity and exploration is the best path toward a lifetime of discovery and learning. He enjoys surfing, backpacking, cooking, reading, drawing, guitar, and species identification (especially birding!)
Aron Kingsbook — Science Department Chair, Math, Science, PE

Born and raised in Marin County, Allie received her B.A. in Psychology from Mills College, focusing especially on cognitive psychology but also pursuing interests in biology, computer science, and literature. Allie began her professional career at Autistry Studios, a San Rafael-based makerspace and academic day program for teens and adults on the autism spectrum, where she held several roles over eight years, including Program Director of Education. Autistry fostered Allie's love of working with students with complex cognitive profiles and convinced her of the power of individualized approaches to learning. After leaving Autistry, Allie taught Math, Biology, Anatomy & Physiology, and Psychology at Headlands, where she was taken in by the school's community and commitment to student growth. During the 2021-22 school year, Allie worked as the STEAM Integration Specialist at San Domenico School in San Anselmo, where she taught computer science and tinkering, helped run and develop the school's makerspace, and assisted teachers in grades K-12 in bringing making and project-based learning to their classes. Now, given her passion for and commitment to working directly with individual students, Allie is thrilled to return to Headlands. In her spare time, Allie loves reading, ballet and modern dance, science fiction and fantasy, and games of all kinds.

Allie Mages — English, Math, Science

After attending a STEM-focused high school in Nashville, David switched gears to the ALPHAS (arts, literature, philosophy, history, anthropology, and semiotics) receiving his B.A. in Classics from Carleton College. His career path has meandered from coffee shops to accounting firms to educational behemoths—working at both Pearson and ACT—but he always returns to teaching and tutoring and now has over twenty years of experience working with students of all ages and backgrounds. As an independent scholar, David has published on satire, finance, and independent filmmaking, and in his free time he plays chess and enjoys the beauty of the Bay Area.

David Maynard — English Department Chair, Math, Science, English, History, Social Sciences
Roanan was born in Minneapolis and was raised there until moving to the Bay Area when he was a teenager. A recent college graduate, Roanan received his degree in History from the University of Santa Cruz. Roanan has always been passionate about History and the tools it provides to help us understand ourselves and the material world around us. Outside the classroom Roanan enjoys listening to and playing music, taking in the awe-inspiring scenery of the Bay Area, spending time with his family, and supporting the local professional baseball and basketball teams
Roanan McCaa — English, History
Alistair was born and raised in San Francisco, CA, and enjoyed History from an early age. He earned his B.A. in History from UC Santa Cruz, which included a semester studying at Leiden University in the Netherlands and seeing all the things he was studying firsthand. Alistair earned his M.A. in History from San Francisco State University in 2010, and spent some time teaching at the collegiate level and also taking graduate-level coursework in education at UC Santa Cruz. After two years working in the bike-share world, he is back in education and sharing his joy for history with students. In his spare time, he enjoys riding his bike around San Francisco, reading history (especially anything by and about Winston Churchill), hiking around the Bay Area, and attending both SF Giants baseball games and Cal football games.
Alistair Rogers — History Department Chair, English, History, Social Sciences
Mark graduated from the University of Tulsa with a BA in Mathematics and Philosophy. He continued his studies at the Philipps University in Marburg, Germany, where he did research in Mathematics and lectured in a graduate seminar. Returning to the United States, he graduated from the University of Illinois with an MA in Mathematics, and continued his studies at the University of California, Berkeley. He then pursued a career in consulting; over his career he became a partner in two firms, leading consulting teams for major corporations across the United States. Taking early retirement, Mark retired to his first love -- teaching. After over 10 years at Tilden Preparatory School in Albany, he joined Headlands Prep in Sausalito. Mark believes in the deep connection of Mathematics and the Humanities -- with contributions to Philosophy, Music, and Art -- as illustrated by the motto over the entrance to Plato's Academy: "Let no one enter here ignorant of Geometry".
Mark Rowles - Math, Science, History, German
Todd attended Tufts University for International Relations. He studied Spanish for more than 20 years. His love and passion for the language inspired him to move to Madrid, Spain where he immersed himself in the culture and lived with a Spanish family who spoke no English. Todd has worked for Stanford University's Online High School for many years. As a result, he has a unique perspective on the rigorous demands of pre-collegiate students who strive to excel. He brings individualized attention to each student and welcomes all students, regardless of status. He has taught intensive Spanish classes and has tutored Spanish conversation since 2000.
Todd Snyder — English, Spanish

Chizuki Squiers was born and raised in Japan and graduated from Meiji University with a B.A. in English Literature and acquired her teaching license in TESOL in 1993. After teaching in Japan, Chizuki moved to the U.S., where she graduated from San Francisco State University with an M.A. in Mass Communication. Additionally, Chizuki wrote for the Hawaii Pacific Press newspaper as a journalist/columnist during her time in Hawaii and later in Oregon. Currently, she lives in Sausalito, CA with her husband and two daughters, and has been teaching at San Francisco Japanese school since 2014. In her free time, Chizuki enjoys playing piano, listening to music, reading, cooking, and walking her dachshund.

Chizuki Squiers — Japanese

Oliver received his B.A. in Biological Anthropology from the University of California Santa Barbara with a minor in Art. Both his passion for teaching and art started at UCSB, where he was introduced to the College of Creative Studies, a subdivision of the college where he took painting courses and developed his senior thesis. It was through this program that he gained attention from the school and was featured in the school newspaper for helping others tap into their creativity. Oliver maintains homeostasis in his life by painting and researching scientific articles. He lives by the quote “art and sciences are branches of the same tree” by Albert Einstein. Oliver started tutoring students in math, science, and English while attending college and continued tutoring students in group homes after he graduated. To keep spreading his love for art, he teaches plein-air painting courses at a summer camp in the East Bay. Oliver has also written an autobiography as well as a book of short stories. To stay active, Oliver enjoys skateboarding, hiking, surfing, playing volleyball, and soccer.

Oliver Thompson — English, Math, Science

Marjorie is a lifelong environmentalist with a passion for teaching. She earned a BS from UC Davis and a doctorate from UC Berkeley, both in chemical engineering. She has been a lecturer at UC Berkeley, specializing in teaching about energy and technological solutions to climate change, and has conducted research on carbon capture and bioenergy. Marjorie loves to explore new ways to engage learners of all ages and backgrounds, and she believes that science and math are for everyone! For over twenty years Marjorie has lived in Marin County, where she raised two children and has hiked or run on nearly every one of Mount Tam’s enticing trails. She loves being active outside and playing games of all kinds inside. Marjorie is thrilled to be part of Headlands Preparatory School.

Marjorie Went — Math, Science