Derrick Leonard

academic dean, director of student life, international dir. 

spanish, U.S. history

Derrick has been with ESCS since 2013. He has taught 6th-12th grade for over 20 years. He teaches both History and Spanish here at ESCS. He learned Spanish while working at a Salvation Army orphanage in Veracruz, Mexico and has traveled to 30 countries and all 50 states. In his free time he likes to spend time with his daughter Mia, riding his mountain bike, and going to Lake Tahoe. 

  • B.A., Journalism & Advertising - University of Nevada
  • California CLAD Teaching Credential - College of Notre Dame
  • ACSI Secondary Teacher Certificate

"Unless the Lord builds the house,

They labor in vain who build it;

Unless the Lord guards the city,

The watchman stays awake in vain."

Psalms 127:1

(510) 223-1966 ext. 20

Kathy ruiz


Kathy started working at ESCS in 1990. She loves working here and brings a certain level of love and care to everything she does. Kathy enjoys spending time with her son and her daughter. She also loves to cook and garden.

"For then as Christ hath suffered for us in the flesh,

arm yourself likewise with the same mind:

for he that hath suffered in the flesh hath ceased from sin.

That he no longer should live the rest of his time

in the flesh to the lusts of men but to the will of God."

1 Peter 4:1-2

(510) 223-1966 ext. 10

Julieta cubas

Administrative Assistant

Julieta is the administrative assistant for the Chairman of the Board, Russ Sturm. She works hard to maintain the culture and learning environment here at ESCS. Julieta has been a part of the ESCS family since 2010 when she started volunteering. Julieta came on staff in 2014. 

She loves the fact that she is able to witness as her own kids and our ESCS students develop and mature from kids into young adults and seeing where the Lord may lead them to. In her free time, Julieta enjoys spending time with family and friends, trying different restaurants, food & desserts, watching movies, and reading a good book.

  • B.S., Computer Science - Golden Gate University

"I can do all things through Christ, who strengthens me."

Philippians 4:13

(510) 223-1966 ext. 14

jan wood

business administrator

Jan has been working as the financial advisor at ESCS since 1981. Both of her children attended ESCS. She loves doing math, working with numbers, and administrative work. In her free time, Jan loves spending time with her grandsons, reading, and quilting. She loves ESCS and the people who work here. 

"Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God." Philippians 4:6

(510) 223-2242 ext. 151

charlie nason


Charlie started at ESCS in 2015. Charlie is a pastor and a teacher. He currently teaches here, at the Cornerstone Bible College and Seminary, and at his local church. His heart is to equip Christians to better understand the gospel so they may share Christ in the community and reach the lost. He enjoys spending his free time with his wife Anna and their five children.

  • B.A., Organizational Management - Master's University
  • M. Div. Theology - Cornerstone Bible College and Seminary
  • ACSI Secondary Teacher Certificate

"I am not ashamed of the gospel, because it is the power of God that brings salvation to everyone who believes."

Romans 1:16

(510) 223-1966 ext. 21

scott cox

science, pre-algebra/algebra, geometry, u.s. history, art

Scott started teaching at ESCS in 2010. He has worked as a Research Scientist, a lab technician, and in Management Technology at Clorox, Chevron, and Bank of America, respectively. He has been a substitute teacher as well and brings a wealth of knowledge and insight to our students. He loves literature, history, art appreciation, photography, birding, botany, hiking and swimming.

  • B.A., Chemical Engineering w/Teaching Option - Cal Berkeley
  • ACSI Secondary Teacher Certificate

"Being confident of this very thing, 

that He who has begun a good work in you will complete it."

Philippians 1:6

(510) 223-1966 ext. 16

Henok tecleab

math, science

Henok is fairly new to our staff here at ESCS. He started in 2016. He teaches Mathematics for 7th grade through 12th grade. He brings a fresh look on math and life to help the students enjoy learning. Henok loves working at ESCS because he believes the main purpose of the school is to build a nation by training children according to the word of God. 

  • A.A., Accounting - University of Asmara
  • B.A., Mathematics - University of Asmara
  • Diploma, Teaching Training - Asmara Teachers Training Institute

"But if serving the Lord seems undesirable to you, 

then choose for yourselves this day whom you will serve. 

But as for me and my household, we will serve the Lord.”

Joshua 24:15

(510) 223-1966 ext. 18

lucille ojeda

food coordinator, eagle's nest supervisor

Lucille has been a part of our ESCS family since 1979. She started at the elementary campus and eventually transitioned to the junior high and high school campus. All 3 of her children attended ESCS. Lucille loves to spend time with her 4 grandsons. She enjoys collecting new recipes and trying them out for her family.

Mrs. Ojeda's number one enjoyment is studying God's Word. She learns something new everyday and says the Word feeds her soul. She loves interacting with the students and says that is what keeps her coming to work everyday. The students love her Otis Spunkmeyer cookies at break!

"Trust in the Lord with all your heart

and lean not on your own understanding.

In all your ways submit to him,

and he will make your paths straight."

Proverbs 3:5-6

(510) 223-1966 ext. 29/21

lynda camacho

band, music

Lynda has been our music director since 1990. She teaches band here at the junior high and high school campus. She also teaches music to all the elementary classes as well. Lynda appreciates the fact that at ESCS, we can openly talk about, praise, and sing songs to God. She loves working with children and the staff here. 

  • A.A., Music - Diablo Valley College
  • B.A., Music - Cal State Hayward

"I can do all things through Christ, who strengthens me."

Philippians 4:13

(510) 223-1966 ext. 38

jean bradbury


Jean wears many hats at ESCS. She is the librarian here at the junior high and high school campus and at the elementary school. She also teaches computer class for the second through sixth grade students. Jean spent 8 years as a parent volunteer before she began working at ESCS in 2002. Jean loves all her students and her co-workers.

She cheers for the bay area teams and the UC Davis Softball team. In her free time, Jean loves taking tap/jazz dance classes, watching her daughter play softball, and playing with her granddaughter.    

  • A.A., - Contra Costa College
  • Certification - Western College of Travel Careers

"Three things will last forever: faith, hope, and love. 

And the greatest of these is love."

1 Corinthians 13:13

dave campbell

facilities supervisor

Dave is our facilities supervisor at the junior high/high school campus. He makes sure we are all taken care of and that our campus runs smoothly. Dave has been on staff with us since 2007.  Dave loves working in a Christian environment. 

He loves playing baseball with his three sons and spending time with his family. Dave roots for the San Francisco Giants. 

"I can do all things through Christ, who strengthens me."

Philippians 4:13  

Russell Sturm

Pastor, Chairman of the school board


Russ has been the pastor at Central Assembly since 2014. He brings a certain upbeat and joyful attitude to both campuses, as the Chairman of the School Board. Both of his daughters attend ESCS. He loves working in an environment where everyone is on the same page, serving God. In his free time he enjoys going on long rides on his motorcycle. 

"I can do all things through Christ, who strengthens me."

Philippians 4:13