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Our Staff

Arroyo School is proud to have an excellent team of educators. A full list of the staff and email addresses can be found on the Contact Us page. See teacher's website or Shutterfly sites for class information.


Principal, Alexandra Friel

  • This is my 18th year in Education. I spent most of my 10 years teaching 5th grade. I have also taught Kindergarten, 3rd and 6th grade. Moving out of the classroom, I began my administrative career as an assistant principal, then principal. Most recently I spent two years as the Coordinator of English Language Development, developing curriculum and support for teachers and principals.
  • I love spending time at the ocean with my husband and two young boys. We enjoy most anything outdoors. We are also avid travelers and spend lots of time on the road exploring new places.


Interim Principal, Jean Dehner

  • I began my California teaching career in 1971 at Central Middle School teaching science, sewing, and Decisions to seventh and eighth grade.
  • I became a counselor at Central, then an assistant principal and principal at Central  and Arundel.
  • After retiring from the school system, I acted as GATE coordinator, library liaison and served several interim principalships.   
  • Golf and downhill skiing are favorite sports.  Being grandmother to 3 ages 7, 10 and 4 is the highlight of my  life.
  • I also enjoys being a docent at the Museum of San Carlos History, Lions Club,  and Chickens’ Ball.

Tracey Olazar, Secretary

  • I have worked in various capacities with the SCSD PTA's for 14 years.
  • I have worked for SCSD for the past 4 years as a Para Educator and Secretary.
  • Hobbies: I love to travel with my family and friends. I enjoy music, coffee, animals, horseback and bicycle riding, the beach and mountains.

4th Grade Teachers:


Krista Carroll

  • I started teaching in 2001.
  • I have taught grades 1, 2, and 3. I taught in the Pacifica School District for 10 years, Santa Cruz County for 2 years and volunteer taught in Antigua, Guatemala and Bradford, England.
  • Hobbies: Spending time with my family, running, biking, reading, and traveling.

Kirsty Mooney

  • I have enjoyed the career of teaching since 2002.
  • My teaching experiences include: K, 1, 2, 3, 5 and 6.
  • Relaxations and passions in life include: Time with my family and friends, being in nature-especially hiking, creature-all with a slight aversion to smaller creatures that “crunch”, science and art, playing with words, sharing that "ah-ha" or "Woah! That’s cool!" moment.

Nicole Murray

  • I have been a credentialed teacher since 2005.
  • I received my masters in special education in 2016.
  • I have taught grades K-2 and 4-8 in varying capacities.
  • I was a textbook editor at McGraw-Hill in Chicago.
  • Hobbies: Running, yoga, reading, music, spending time with friends and family!

Megan Scatena

  • I started teaching in 1998 and have taught in East Palo Alto, Pleasanton, and Los Altos.
  • I've loved teaching 1st and 2nd grade and am excited to move up to 4th!
  • Hobbies: Spending time with my family and friends, exercising, and traveling

Sheila Sevilla

  • I began my teaching career in 1996, and joined the San Carlos School District in 2001.
  • I’ve taught 1st, 2nd, 4th and 6th grade.
  • Hobbies: I love being active outdoors hiking, running, and bike riding.  I also love to spend time with family and friends, and enjoy lifelong learning.

5th Grade Teachers:


Marianne Cheatham

  • I started teaching in 1992 in Simi Valley, then continued teaching in San Mateo before taking time off to stay home with my 3 daughters.
  • I was hired in San Carlos in 2008 as a substitute, then a part-time and finally a full-time teacher.
  • I have taught 1st thru 5th grades.
  • Hobbies: Outside the classroom I enjoy spending time with family and friends. I love reading, listening to music, baking, and being outdoors.

Jennifer Crettol

  • I started teaching 5th grade in 2007 at San Carlos School District (Central Middle School).
  • I have taught five years math/science core, and four years language arts, social studies, math, and science (self-contained).
  • Hobbies: Disneyland (and all things Disney), traveling, photography, reading, baking.

Maggie Gallagher

  • I come from Southern California, where I taught all elementary grades, K-6 for 18 years at Knolls Elementary.
  • I was then a principal for four years at the above school.
  • I moved to Northern California in the summer of 2017 and spent the school year assisting in an elementary school close to my home.
  • My interests are music, traveling, spending time with my family, especially my grandchildren, reading literary fiction, riding my bike, and taking walks with my Pomeranian buddy, Max.

Shelli Murphy

  • I started my teaching career in 1998.
  • I’ve taught kindergarten, 5th and 6th grade.
  • Hobbies: Spending time with my family and friends are a few of my favorite pastimes. I thrive to be active and especially love to run, hike, and ski. When I’m feeling especially adventurous, I join my boys (Joe, 12 and James, 8) on the ice for a little hockey.

Angela Naughton

  • I began my teaching career as a volunteer at Kilimani Elementary in Arusha, Tanzania, in 2003.
  • Following my student teaching in grades 2, 3, and 4, I joined SCSD in 2006, working first as a Resource Specialist for grades 5-8, before moving to teaching 5th grade in 2012.
  • Hobbies: I enjoy reading, writing, bike riding, and spending time with my family in San Francisco and Lake Tahoe.

Michelle Robinson

  • I started my teaching career in 1997.
  • I have enjoyed teaching both in the middle school and elementary level -  8th, 5th, 4th and 3rd grade.
  • Hobbies: I LOVE laughter and enjoy spending time with family and friends. My favorite place to be is the beach. When I’m not teaching, I love to read and spend time with my family.

Education Specialists:


Jenny Brady

  • Last year I taught 5th and 6th grade at Tierra Linda Middle School.
  • I’m looking forward to a new school.
  • Hobbies: I enjoy traveling, hiking, and spoiling my cat.

Miriam Seigel-Stern

  • I started teaching in 1983.
  • I’ve taught 1st-4th, 1st-3rd, 3rd-4th.
  • Hobbies: Family, friends, walking, outdoors, reading, movies.
  • My own children attended White Oaks, Central and Sequoia

Meagan Vizier

  • I have taught for 15 years - 5 years at Central, 5 years at a nonpublic school in San Francisco and 5 years at Ingrid B. Lacy Middle School in Pacifica.
  • Hobbies: Running, playing soccer, reading, spending time with family and friends.
School Counselor:

Andrea Dimas

  • I started counseling in 2008 with a middle school in San Francisco.
  • Since then, I have been a counselor for multiple grade levels, age groups, and settings throughout the bay area - including high school, preschool, elementary school, and adults.
  • Hobbies: Volleyball, Snowboarding, Art, Traveling the world, Laughing and Playing with family and friends.
PE Teachers:

Patti Blumen

  • I began my teaching career at Central Middle School in 1988.
  • I have taught physical education and coached volleyball and basketball.
  • I grew up in Brentwood, CA (east bay) on a farm producing apricots and pistachios.
  • I love to spend time with my family. I enjoy traveling, hiking, genealogy, and spending time with friends and my dogs.

Alaina Cardona

  • I’ve been teaching 6th, 7th, 8th Physical Education since 2012.
  • I love spending time with my son and husband. I have two dogs, Lola and Coco, a cat named, Ninja. I love animals!
  • I really enjoy watching the San Francisco Giants and 49ers and of course, the Warriors. My favorite places to travel are Disneyland, Hawaii and Boston!
Exploratory Wheel & Enrichment:

Colyn Fischer, Orchestra Director

  • I've been teaching music since 2005, starting in my native Pennsylvania and since 2008 here in San Carlos. Before that I was a professional violinist in Pittsburgh and Chicago.
  • I've been playing violin since 1980 and after school I put my musician cape on and try to make the world a little more awesome with my fiddle!
  • I have a cat named "Petunia" with lots of whiskers and personality who likes to sing at night.
  • Hobbies: Hiking, camping, travel, reading, writing, listening to good music and making art!!!

Nick Garcia, Band

  • I have been teaching music since 2012 and have been teaching in San Carlos since 2017
  • I have a lot of experience instructing high school marching band programs in both Northern and Southern California and also run a brass section of a drum and bugle corps from Concord, CA
  • My fiancée, Laura, is also a teacher in Dublin, CA where she teaches 4th grade
  • Hobbies: golf, Ultimate Frisbee, traveling, reading, cooking, and making music!

Heidi Geiges, Makerspace

  • I began my teaching career in 1999 in the San Carlos School District.
  • I've taught 3rd (Heather), 4th (Brittan Acres, Heather, and Arroyo, and 5th (Central)
  • I received my Master's in Educational Technology in July 2017.
  • I love making education fun for all students and exposing them to different ways of learning through technology and creating.
  • Some of my passions outside of the classroom are attending concerts, going to the theater, visiting museums, traveling, and hiking.  

Greg Zillmer, Design

  • Started teaching: 2009
  • Have taught: 1st & 2nd grade; 6th grade Math & Earth Science; 8th grade Math; 4th-8th grade Design Thinking; 7th-8th grade Computer Science
  • Hobbies/Passions/Interests: Spending time with my wife and daughter; playing and watching sports, especially basketball, baseball, and hockey; going on adventures, both down the street and around the world; and eating anything and everything!

Mindy Hill, Garden/Living School Yard Design

  • I became a teacher over 25 years ago and taught K-8 all over the Western US and New Zealand while also earning my administrative credential.
  • I became the Wellness Coordinator for SCSD in 2013 with a grant with Sequoia Healthcare District, and since then have enjoyed every minute developing and managing our district's programs for mental health, elementary PE, middle school sports, school safety, health education, nursing, parent education, and school lunch.
  • The opportunity to teach Living Schoolyard Design and manage the beautiful school garden at Arroyo this year fills me with joy because I get to see students learning how to feel more alive and help biodiversity thrive every day.
  • In my spare time, I volunteer for Healthy Cities Tutoring and spend time adventuring in the outdoors with my husband and two teenage sons, and playing with our pets



Katie Hulgan, Library


  • I started as the Central/Arroyo Librarian in 2013 when my kids were students here at the school.
  • In addition to checking out books to the students I love bringing other literary experiences to Central Arroyo: author events, librarian visits, crafts and games.
  • Hobbies: Reading, knitting, coffee!, word puzzles, walking my dog, visiting the beach