Originally from Rhode Island, Mr. Ceresa drove out to California in three days in 1994 after earning his Bachelor of Arts in Economics at Bryant University. A few years later, he earned his teaching credential from CSU-East Bay while working full-time for an investment management firm and planning his wedding. He now has the opportunity to help people as they begin to make one of the biggest decisions of their lives! Besides enjoying math and logic puzzles, Mr. Ceresa is an avid runner and helps coach the cross country and track teams here at Northgate.

Ms. Costello graduated from CSU Sacramento with a BA in mathematics. She has taught subjects from Algebra 1A to AP Stats for 30 years (the last 5 years were at Ygnacio Valley High School).  She loves teenagers and loves hearing students say, “Now I get it!” in math.  She enjoys doing yoga, walking, and hanging out with her family.

Mr. Tobin graduated with a BA in Math & History, and a PGDE in Math & History from University College Cork, Ireland. He also graduated in Engineering from Cork Institute of Technology.  After teaching in Ireland for two years, he decided to leave home (Ireland) to explore some other education systems. He has taught IB Math in numerous countries including Ireland, Australia and the US. He began working at Northgate in 2010 and established an engineering department with Mr. Lyons in 2012.

He is married to Maya (they met at Mr. Tobin's best friends wedding in Ireland) and he has a son Lochlan. His interests include soccer, golf and, reading non-fiction. He is passionate about Metallica, and Liverpool Football Club. 

Driven by her personal passion to lead our youth in educational advancement, Dr. Weinstock Mehl brings a contagious energy to the classroom and propels our teens on the journey of self-discovery.

DocW, the name she prefers as it was given by her All-Star students, loves the connections that come alive in the classroom. Every day brings new opportunities to learn from each other as well as to support each one’s recognition of her/his own special talents.

DocW shares her background as a contributor to both schools and organizations. She is a 20 year teaching professional at Miami Dade County School District, AT&T, the University of San Francisco, and Mt. Diablo Unified School District. Her travels to Hong Kong, Chengdu, Guangzhou, China, Bangkok and Chiang-Mai University, Thailand are a highlight in her research capturing multicultural perspectives in learning models. Her educational experience spans both East and West coastlines: Doctor of Education (Ed.D), University of San Francisco, Master of Arts (M.A.), Mathematics, University of Miami, and Bachelor of Science, (B.A.), Journalism and Communications, University of Florida. She earned additional credentials from multiple accredited universities: Instructor Credential, The California Community Colleges, Mathematics; Single Subject Teaching Credential, Mathematics, K-12 and Adult Education; and Preliminary Administrative Services Credential. She is an avid animal lover and claims “kitties rock!” She also loves dance, yoga, mindfulness, traveling, and scrapbooking.  Check out more about DocW on https://www.linkedin.com/in/ellenweinstockmehl/