Mission, History, Heritage

A Lasallian Catholic School

Our Mission

Justin-Siena is a Catholic high school in the Lasallian tradition called to provide educational excellence in a loving, Christ-centered community that prepares students to serve and to lead in an ever-changing world. Born of a collaboration between the Dominican Sisters of San Rafael and the De La Salle Christian Brothers, Justin-Siena has served families in Napa, Solano, and Sonoma Counties since 1966. Although firmly rooted in Napa, we are part of a Lasallian ministry that spans continents, centuries, and generations.

History and Heritage

In 1966 two schools opened on adjacent campuses--Justin High School (for boys) sponsored by the De La Salle Christian Brothers and Siena High School (for girls) sponsored by the Dominican Sisters of San Rafael. Merging in 1972, Justin-Siena High School continues today as part of a world-wide network of almost a thousand Lasallian schools found in 84 countries.


We are ALLHeart

Being "ALLHEART" means two things at the same time. It is about making the most of what we have been given, regardless of our starting points. And, as we become all we were made to be, we live our lives for the benefit of others. We are driving and selfless; relentless and altruistic, for self and for others. We do well to do good. Our identity is lived. Being all heart means taking action. We believe, we love, and we will.
We believe. Only by believing in ourselves and each each other will we reach our full potential. Belief is the confidence of knowing that our lives have purpose, and that God is with us.
We love. We love so we fully give ourselves to others. Only in the context of love will we become who we were made to be - individually and collectively.
We will. Willpower is present within all of us . We have the power to will a better reality into existence.

Our School Seal

In addition to identifying our physical location and the year of our founding, our seal contains the history of our school. The Justin-Siena High School seal embodies the icons of the Dominican Sisters of San Rafael (who co-sponsored the school through the 2005-06 academic year) and the De La Salle Christian Brothers. 

The original black and white cross, or Fleury, has been associated with Dominicans since the 13th century and indicates a spiritual ideal in spreading the Gospel of Christ by preaching and teaching. The five-pointed star signifies the sign of faith, which guides all Christian Brothers and Lasallian partners in their vocation of Christian education. 

The shield containing these two icons symbolizes the Dominican shield which first appeared in the early 15th century when the Order of Preachers began using the shield as a coat-of-arms for identification. Finally, Sempre Avanti heralds the legacy of the Brothers, and more specifically, Justin High School. Meaning always forward, these words appeared on the original school seal of Justin High School representing a commitment always to look forward and to uphold a high standard for preparing students to serve and to lead in an ever-changing world.

Justin-Siena High School

4026 Maher Street
Napa, CA, 94558
United States
T: 707.255.0950 
F: 707.255.0334
Justin-Siena is a Lasallian Catholic college preparatory community that serves young people in grades 9–12.