Yvonne Pastor, Co-Director

I've been working at TTT since 1984 first at the Fairmont site with infants and preschoolers in 1993 I moved to the South San Francisco site as the Director. I attended SF City College and Canada College. I have my Associate of Art Degree in Early Childhood Education and my Master Teacher's Certificate.

I'm married to my High School sweetheart, have three children and two grandchildren. In my spare time I enjoy spending time with my grandchildren, walking/hiking, camping & traveling. I'm involved in two women's groups & my Cursillo group. I'm fluent in Spanish and am CPR/First Aid Certified.


Selma Hammaker, Co-Director / Teacher

I have been in the child care field since 1980 and have been at TTT since June, 1989. I attended Skyline College and San Francisco City College, and I have more than 24 units in Early Childhood Education. I have worked with infants and preschoolers for most of my career and started working with school age children in 2010.

I have a son and a daughter who both attend college and in 2014 I got married. In my spare time, I enjoy going to the movies, reading, visiting with friends and family, and walking at the park. I am CPR and First Aid Certified.


Rosa Estrada, Pre-K Teacher

I began working in the child care field in 1983 and started working at TTT in 1996. I Studied Early Childhood Education in Guatemala and finished my ECE units at Skyline College. I currently hold a Child Development Associate Teacher permit. My hobbies are drawing, dancing, walking bike riding and going to the gym. I speak Spanish fluently and am CPR and First Aid certified.





Cathy Liu, Teacher

I have been working with children for 39 years and started with TTT in 1996. I am the lead teacher in the Teddy Bear room. I have my Associates Degree in Early Childhood Education and my ECE Certificate. I love to play the piano for the children.


Khristine Gatchalian, Aide

I started working with kids in 2009. I love working with kids because they are our future and we inspire them to learn new things each day. I love teaching kids and also having time to have fun and be silly with them. I started work at TTT in 2018.  When I am not working I like taking walks, spending time with family, going to the beach and being with my son. I have 6 ECE units and a Bachelors degree in psychology.