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Our Staff

The teachers and staff of Dr. William L. Cobb Elementary School provide a safe and caring learning environment, promote divergent and critical thinking, and foster the inherent potential within each child. Our dedicated academic support teachers work with students both in the classroom as well as in individual and small group settings so that each student may reach his or her individual learning goals. The enrichment teachers see students once a week for fun and engaging lessons. Our teachers and students are supported by a strong administrative and school staff who ensure a safe, happy, and healthy learning environment.

Learn more about preschool and after school program teachers and staff. 

K-5 Teachers

Ms. Snell, Kindergarten

At Cobb since 2014


Ms. Alexandra Snell earned her Master of Arts in Teaching with a concentration in Urban Education and Social Justice from the University of San Francisco. She earned her Bachelor of Arts degree from Colgate University in Hamilton, NY. Ms. Snell has also lived in Boston and Dijon, France! She loves reading fiction, exercising, eating Mexican food, cuddling her cats, and dancing with friends.




Ms. Melocoton, Kindergarten

At Cobb since 2017


Ms. Joyce Melocoton is originally from Southern California and has been teaching for over 9 years. Ms. Melocoton received her Bachelors of Arts from Long Beach State University and her Masters of Science from California Baptist University in Riverside. She is currently working on her Masters in Educational Leadership from California State University, San Marcos. Her teaching experience includes kindergarten, continuation high school, and middle school social studies. Her passion belongs to the lower grades and she enjoys every minute of it! Miss Melocoton loves to travel. Recently, she combined her love of travel and education by teaching English in Thailand.


Ms. Suzuki, grade 1

At Cobb since 2017


Ms. Ran Suzuki received her Master’s Degree from University of San Francisco through San Francisco Teacher Residency (SFTR). Prior to that, she served as an AmeriCorps member with CityYear LA, working with high school students in underserved communities, all of which helped build on her commitment towards equitable teaching and social justice. Ms. Suzuki grew up in Los Angeles and enjoys traveling, being outdoors, discovering new delicious food, and yoga.




Mr. Richard Miller, grades 1 & 2

At Cobb since 2017


Mr. Miller was born in Manchester, England, but spent most of his childhood in San Diego, California. He moved to the Bay Area in 2000 and has been teaching 2nd and 3rd grade for over 12 years. While he's always understood the importance of teaching the core curriculum, Mr. Miller also embraces the opportunity to teach beyond the scope of academics. He finds it equally important that his students build lasting friendships, learn to solve their problems independently, and always reach for the stars! When he's not busy teaching, Mr. Miller enjoys traveling, handcycling, watching football, and spending time with his family and friends.



Mr. Hughes, grades 2 & 3

At Cobb since 2014


Mr. Oliver ‘Sam’ Hughes is a long-time San Francisco resident who made a career change from landscape-gardening to teaching elementary school. He earned both multiple subject and special education teaching credentials at San Francisco State University. He began teaching third and fourth grades at Cobb Elementary in 2015, and is very happy to be part of the Cobb Community. Mr. Hughes lives in the Lower Haight with his wife, two sons, their housemate and two chinchillas. Mr. Hughes has traveled to parts of Europe and Asia, and hopes to do so again with his wife and kids. He enjoys gardening, cooking, teaching his boys camping and survival skills, and reading novels when he has the time.


Ms. Coombs, grades 4 & 5

At Cobb since 2017


Ms. Holly Coombs is excited to work in the community in which she lives and where her kids go to school. She previously worked as an elementary teacher at Anna Yates Elementary School in Emeryville for 15 years, in East Palo Alto for 3 years, and in Namibia for 2 years. Ms. Coombs earned her Masters in Education and teaching credential from Mills College. She earned her Bachelor of Science from Georgetown University. She enjoys spending time with her family, including her young kids, both at school in SFUSD.




Ms. Peyton, grades 3 & 4

At Cobb since 2016


Ms. Barbara Peyton brings to Cobb over 25 years of teaching experience. She earned her Bachelor of Arts degree from California State University, Sacramento. Ms. Peyton enjoys walking her dogs on the beach, yoga, reading, and find the best places to eat in the city.


Academic Support

Ms. Stoltz, Literacy Coach
At Cobb since 2012

Ms. Megan Stoltz brings over a decade of educational experience to Cobb. She earned her Bachelor’s of Arts from the University of California, Santa Barbara. She then went on to earn her Teaching Credential and Master’s Degree at Pace University in New York City. She taught in the Bronx, New York, for two years and then decided she couldn’t handle the snowy winters and returned to the Bay Area. She is passionate about the academic and social growth of the school. In her spare time, Megan makes and sells jewelry at local craft fairs, sews, surfs, and enjoys her monthly subscription to Oprah Magazine.



Ms. Moskowitz, Instructional Reform Facilitator
At Cobb since 2015

Ms. Dina Moskowitz has been teaching in different capacities for nearly 20 years, begining with teaching Sunday school when she was 13. While she attended college at Wesleyan University in Connecticut, she had a variety of jobs in education, including being an Outward Bound instructor. She taught at a Reggio Emilia-inspired elementary school in Seattle and went on to get her Teaching Credential and Master’s Degree in Education with a focus in teaching from Mills College in Oakland. She has taught at a variety of elementary and middle schools in Oakland and San Francisco. Her work at the school focuses on supporting teachers in their craft and raising the achievement of students at Cobb. When she’s not working, she can be found sewing, playing soccer or eating out around the city.


Ms. Garibaldi, Academic Response to Intervention Facilitator

At Cobb since 1997


Ms. Rinelle Garibaldi has been teaching at Dr. William L. Cobb School since 1997. She earned her Bachelor of Arts in Rhetoric from the University of California at Berkeley. She then went on to earn her Multiple Subject teaching credential, with a focus on Clinical Schools, at San Francisco State University. During her free time, Ms. Garibaldi loves traveling, long hikes, dinner parties, live music, dancing, and enjoying the company of loved ones and friends.



Ms. Tara, Inclusion Teacher
At Cobb since 2012

Ms.Tara Sessa is a 3rd generation San Franciscan. She has been in education for over 18 year and as long as she can remember she has always wanted to be a teacher. Tara remembers how important teachers were to her early development started teaching preschoolers. She loved teaching the little ones but decided that she wanted to specialize in Special Education at the elementary level and went back to school to earn dual credentials in multiple subjects and special education with a Masters in mild to moderate special education. When not teaching, Tara loves cooking, reading, roller skating, watching movies and spending time with her son exploring the Bay Area.


Ms. Morgan, Physical Therapist
At Cobb since 2016


Ms. Morgan Arnold is a pediatric physical therapist who recently moved to San Francisco from Chicago. Morgan previously worked for families in the Chicagoland area helping children with developmental delays through the Early Intervention Program. She graduated from Michigan State University with her Bachelor of Science majoring in Kinesiology with a specialty in Health Promotions. She then moved to Atlanta, Georgia where she attended Emory University’s School of Medicine earning her Doctor of Physical Therapy. When she is not working, Morgan enjoys being outdoors, running, hiking, traveling, and enjoying time with her family and friends.


Ms. Nicole Peed-Forte, Inclusion Paraprofessional









Ms. Sarah Gragnani, Occupational Therapist


Ms. Erica Hirschberg, Speech Therapist


Ms. Ashlee Smith, School Psychologist

Enrichment Teachers

Mr. Gholson, Education Outside

Mr. Tyler Gholson is a naturalist who has worked with many Bay Area organizations, including San Mateo Outdoor Education and Field Guides where he led hikes with 4th, 5th and 6th grade students teaching natural history and science. Tyler grew up in Philomath, Oregon, and is a graduate of Evergreen State College with a Bachelor of Science in Ecology. He has been a soccer coach, backpacking trip leader, and a caretaker for adults with disabilities. He enjoys traveling, backpacking, writing, creating music on the guitar, banjo and anything else he can get his hands on.

Coach Donna Chan, Playworks


Ms. Kimura, Instrumental Music

Ms. Kyoko Kimura has been teaching music for over 20 years. She earned her Bachelor of Arts in Music Education at the University of Washington, and her Masters in Flute Performance at the California State University, Fresno. Her passion is to teach values such as peace, love, and respect through singing, playing various instruments, and playing games. When Ms. Kimura is not teaching music at SF schools, she volunteers at a meditation center in SF and a retreat center in Novato where she facilitates workshops and meditation classes.


Ms. Merrill, Visual Arts

Ms. Dana Merrill graduated from the University of San Francisco with a Bachelors Degree in Fine Arts and a Masters Degree in Multiple Subject Education. Outside of school, Ms. Merrill loves visiting her family in Los Angeles, cooking, hiking, and going to the movies!


Mr. Steve, Music and Drama

Mr. Gordon Stevens has a Masters of Arts in Performing Arts and a Bachelor of Arts in Broadcasting from San Francisco State University. He is a credentialed K-5 English language development classroom teacher. Mr. Steve, has been teaching drama and music at five San Francisco elementary schools for over 25 years--a joyful experience! He enjoys composing music, playing music, traveling, poetry, hiking, and camping.


Mr. Paul Bloomer, Physical Education


Ms. Alexandre Petrakis, Librarian

Administrative and School Staff

Mr. Slife, Principal

At Cobb since 2015


Before becoming the Principal of Cobb, Mr. Chad Slife was the founding Assistant Principal of Gateway Middle School. He earned his Master of Arts in Education Administration from San Francisco State University and his Bachelor of Arts in Public Relations from the University of Southern California. He grew up in Riverside, California, and began teaching in San Francisco as a Teach for America corps member. He has also taught in New York City, Guatemala, East Palo Alto, Los Angeles, and Inglewood. He enjoys exercising and running long distances, reading, traveling the world, watching movies and sports (Go Giants!), going to school, and taking his dog Hemingway to the park while spending time with his family.


Ms. Maritza, School Secretary

At Cobb since 2006

Ms. Maritza Carballo has been working at Cobb for over a decade and loves working with children. She moved from her country of El Salvador over 20 years ago following the rest of her family. She is married and has two children, a 17-year-old son and a 10-year-old daughter. In her free time, she enjoys dancing salsa with her husband,  singing karaoke, taking long hikes, and for sure spending time with her family.




Nurse Debbie, School Nurse

At Cobb since 2014


Ms. Debbie Mansfield is a registered nurse with over 30 years experience. Before moving to San Francisco, she worked in a variety of settings including critical care. She earned her Master of Science in Nursing from California State University, Sacramento. Outside of work, she enjoys going for long hikes, yoga, reading, and spending time with her family.




Mr. Schwartz, School Social Worker

At Cobb since 2015

Mr. Matthew Schwartz brings to Cobb over 13 years experience as a social worker in various capacities that include working with dually diagnosed young adults, seniors and children. Mr. Schwartz graduated from California State University, East Bay with a degree of Masters of Social Work in 2012, and has a Bachelor of Arts in Communications from the University of San Francisco. At Cobb, Mr. Schwartz helps set up supports and interventions for students and families, and he manages programs at the Wellness Center. In his free time, Mr. Schwartz enjoys spending time with his family and friends, traveling, exploring the Bay Area, eating out, playing basketball, reading with a book club, and cheering on the Warriors!


Mr. Wingfield, Elementary Advisor

At Cobb since 1990


Mr. Dennis Wingfield has worked in education since 1982. He started as a custodian, then a houseparent in EEC, and then moved into a paraprofessional position. Mr. Wingfield is a graduate of City College and proudly served United States Armed Forces in Germany. He worked as a preschool teacher for 12 years and as a student advisor for almost 30 years. He has found that education is not a place to make a fortune, but that the enrichment of students makes it the perfect field for him. Mr Wingfield now sees former kindergartener students, now parents, whose children now attend the school. He is very proud to be in his position and to have long-lasting relationships with the community and the families.


Ms. Collier, Family Liaison

At Cobb since 2002

Ms. Lissa Collier is a 3rd generation San Francisco native and a proud product of the San Francisco Unified School District and San Francisco’s higher learning experience. She has been part of the Cobb community since 1995 first as a Parent Volunteer before becoming an SFUSD Family Liaison in 2002. Lissa is a self- proclaimed foodie who loves listening to live music bands and reading Maya Angelou poetry. She is an avid San Francisco History buff and fan of Bay Area sports.




Ms. Ping Teng, Cafeteria









Mr. Quinn Zheng, Custodian 








Ms. Shirley Yu, Custodian


Ms. Maxine Bentzman, Recess Monitor