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Mathematics Department



Click the link to visit the Northgate High School Mathematics Website

Teachers & Curriculum Maps

 (Math & Engineering)


(Dept. Head)


Gregory Lyons graduated from Iowa State University with a Bachelor of Science degree in Industrial Engineering.  Gregory worked as a Manufacturing Engineer in the computer industry for 24 years before pursuing a Masters of Education degree in Secondary Education.  Gregory has been teaching mathematics and engineering classes for the past eight years.


Gregory enjoys traveling with his family, umpiring baseball, watching a good movie, quilting with his wife, teaching at engineering camps, and helping others succeed.

  • PHONE: (925) 938-0900 x 2111
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  • Dept. Website:
Geometry - Curriculum Map Geometry - Syllabus Curriculum Map - PreCalculus Honors
Pre-Calculus Honors - Syllabus Principles of Engineering - Curriculum Map Principles of Engineering - Syllabus




  • PHONE: (925) 938-0900 x 1561
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Ms. Branch possesses a Bachelor of Science in Accounting and Finance from the University of California, Berkeley (Winter, 1991), and a Master of Science in Mathematics Education from California State University, East Bay (Spring, 2007).  Her initial professional experience was as an accountant and financial analyst for Morrison & Foerster LLP, and Wells Fargo & Co., respectively.  In 2002, Ms. Branch began a new career teaching economics and government at Hayward High School in the Hayward Unified School District.  Upon successful completion of her credential, she obtained permanent employment as a mathematics teacher in the Antioch Unified School District.  She immediately began a course of study in mathematics curriculum and educational practices for which she received her M.S.  Upon earning her M.S., Ms. Branch founded and ran her own K-8 charter school in Antioch from 2009-2014.  She then returned to the high school environment, teaching one additional year at a military charter school before becoming a math teacher at Northgate High School in Walnut Creek in 2015.  Ms. Branch is a huge Raider fan and an avid runner, and in her free time enjoys traveling to new places to run half marathons.  She lives in Walnut Creek with her daughter Courtni who attends Las Lomas High School.



Algebra 1 - Curriculum Map
Algebra 1 - Syllabus





  • PHONE: (925) 938-0900 x 1561
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Mr. Butterfield has been a math teacher since 1988. In that time he has coached football, basketball, wrestling and track. He no longer coaches but is still actively involved in collegiate athletics as a football official in the Big Sky Conference. He is an avid Harley rider and has ridden his Harley-Davidson motorcycle in 49 states and Canada. He is planning to tour Ireland on a Harley during the summer of 2017. He also plays bass guitar and sings in a classic rock cover band called Deepcreek. Mr. Butterfield and his wife, Wendy, have 7 children and 9 grandchildren, 8 of them are boys!


Algebra 2 - Curriculum Map




  • PHONE: (925) 938-0900 x 1561
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  • Twitter@mrCeresa

Originally from Rhode Island, Mr. Ceresa came out to California in 1994 just looking for something different than Rhode Island. After attending Bryant University for four years and earning a Bachelor's of Arts Degree in Economics, he began with a job in the investment management field. Deciding that this was not the right fit for him, he searched introspectively for what he would enjoy doing most. More than anything, he enjoys helping others, especially helping them find and achieve their goals. 


This is why he decided to become a teacher. He earned his teaching credential from CSU-East Bay while working full-time and planning his wedding. Besides enjoying math and logic puzzles, he now has the opportunity to help people as they begin to make one of the biggest decisions of their lives! As an avid runner, he also was able to coach cross country and track for a couple of seasons and looks forward to doing that again in the future.


He believes that choosing the right college and the right major is only the beginning step to a long life of learning. Especially in today's world, if you are not constantly trying to improve your skills and knowledge, then you will fall behind in your career. He does not believe that career is everything but it will be where you will typically spend most of your time. It must be a reflection of you and your life philosophy in order for you to find happiness. High school will help you begin your path, learn what you love and learn how to work hard. With hard work, many other deficiencies fade away.


As Thomas Edison said, "The three great essentials to achieve anything worth-while are: Hard work, Stick-to-itiveness, and Common sense."  These are three things that he cannot teach you, but you must learn from experience. You only develop experience by trying new things and challenging yourself to do more. Be more.




Syllabus - PreCalc Honors
Curriculum Map - PreCalculus Honors



I grew up in Lafayette, and graduated from Acalanes HS. After getting my AA Degree at DVC, I transferred to Cal Poly S.L.O. where I got my B.S. Degree in Construction Engineering. I met my wife at Cal Poly, when we were both on the Concert Committee. We both worked in industry before deciding to go into teaching. We took our savings and went to Fresno State to get our Teaching Credentials. We ended up coming back to the area to teach. I continue to have an interest in music and also do work, in my "spare time", repairing our home.



  • PHONE: (925) 938-0900 x 1561
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Geometry - Curriculum Map


  • PHONE: (925) 938-0900 x 2114
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BA in Pure Mathematics (1986 Cal State University Northridge)

MS in Mathematical Science (1991 University of Central Florida)

JD (1994 Boalt Hall)

CA Single Subject Credential in mathematics (2005 Chapman University)


Teaching Experience

US Naval Nuclear Power School: nuclear physics and reactor theory (1986 - 1991)

Sierra Academy of Aeronautics: aviation math (1995 - 1999)

Northgate High School: math (1999 - present)


Syllabus - AP Calculus

Curriculum Map - AP Calculus Syllabus - PreCalculus




Tucker is bay area native and graduated from Princeton University in 1998 with a BA in Ecology and Evolutionary Biology. He started teaching science and math in 1999 before becoming an outdoor instructor with the National Outdoor Leadership School. He then started a non-profit and worked as the program director for that non-profit serving inner city children and teens in Richmond, Oakland, and Concord. He then taught math in Sacramento for 6 years before coming back to the bay area to teach math at Northgate where he has been for 4 years. Tucker spends time wrestling with his 3 small boys, hiking with his wife and doing lots of dishes.



  • PHONE: (925) 938-0900 x 2113
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Teaching at Northgate since 2007. Current classes: Statistics and Pre-Calculus Honors. Previous career as financial analyst for Bank of America and Charles Schwab. BA in Statistics from U.C. Berkeley.


Statistics - Curriculum Map

Statistics - Syllabus





  • PHONE: (925) 938-0900 x 2163
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Mr. Lubbe graduated from Northgate in 1997. He is widely considered to be one of the top hackey-sack artists to emerge from the Walnut Creek area in the late 90's. He also earned a reputation as one of the premier Mariokart talents among his group of friends in High School. Today Mr. Lubbe lives in Oakland and enjoys hiking, playing the piano, and cooking.


Algebra 2/Trigonometry - Syllabus Algebra 2/Trigonometry - Curriculum Map Geometry - Syllabus





  • PHONE: (925) 938-0900 x 2121
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Mr. Luneburg was born in New Haven, Connecticut, and grew up in the New Haven area. He attended Yale University and the University of Connecticut School of Law. He worked as an in-house corporate lawyer for a Fortune 100 company for over 20 years, first in New York City and then in the Bay Area. After leaving the corporate world, he eventually decided to attend the Teacher Credential program at Mills College in Oakland, becoming what he now realizes he was meant to be all along - a Math teacher.


Algebra 2 - Syllabus


  (Math & Engineering)



  • PHONE: (925) 938-0900 x 1536
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  • Twitter@Markab3578
  •               @NHSHelpDesk      

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.


Math Class Syllabi

NHSHelpDesk (Computer Tech)

Engineering Curriculum (Need student password)




  • PHONE: (925) 938-0900 x 2120
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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


Algebra 2/Trig PreCalculus


Teacher Name Classes Phone Ext. Curriculum Maps Email Media
Karla Branch ALG I, GEOM x1561 Here Dept.
Charles Butterfield ALG I, II x2110 Here Dept.
Pete Ceresa PRECALC, PRECALC H, AP STAT x1545 Here Website 
Ellen Dill PRECALC, AP CALC x2114 Here Dept.
Tucker Farrar ALG 1, GEOM x2113 Dept. 
Kyong Landry STAT x2113 Here Website
Jan Lubbe ALG II/TRIG x2163 Here Website
Thomas Luneburg ALG I, ALG II, AIMS x2121 Here Dept.

Greg Lyons 

(Dept. Head)

GEOM, PRECALC H, POE x2111 Here Dept.
Mark Tobin HELP DESK, IED, ALG I x1536 Here Engineering, Math, Help Desk 
Ellen Weinstock Mehl ALG II/TRIG, PRECALC x2120 Here Dept