Boldt Faculty


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Working together for student academic success by providing nutritious meals in a cost effective and pleasant environment.


 District calendars are listed and approved two years in advance. For individual schools, only campuses with Google Calendars are featured here.


NISD's mission is to provide all NISD students who are eligible to ride the bus a safe, efficient, nurturing environment that supports the educational and extra-curricular objectives of the district.


Northside ISD continues to enforce its “No Shots, No School” policy. Texas law requires all public school children have current immunizations in order to attend class.

Campus Information

Year Open:

Bond Year:

School Mascot: Mavericks

School Colors: Red, white

Principle Mrs. Siller holding a photo
Rosie Siller - Principal
Rosie Siller has been in education for over 26 years and is the proud Principal at Herbert G. Boldt Elementary. Before coming to Boldt, she had the pleasure of being the Principal at Cable Elementary for over ten years. Mrs. Siller also served as Vice Principal at Julia Newton Aue Elementary and Lackland City Elementary, know renamed Jerry D. Allen Elementary, both in the Northside Independent School District. Her experience includes
being a Reading Specialist at Bob Lewis Elementary and a 7th/8th grade Reading/Language Arts teacher at Horace Mann Middle School in San Antonio Independent School District.

Mrs. Siller grew up in Pearsall, Texas and graduated from Pearsall High School. After graduation, she attended St. Mary's University and received a Bachelor of Arts, Interdisciplinary Reading. She continued her professional growth and earned two master's degrees in Reading
and Educational Leadership from St. Mary's University.

She takes pride in getting to know everyone in the Boldt community. Her dedication and passion is evident as she continues the tradition of success at Boldt. Her belief is that each student deserves to be empowered through their education and each child is indeed a lifelong leader and learner. Though an administrator, her heart is in the classroom.

She was a board member for Girls on the Run a national organization that inspires girls to be joyful, healthy and confident using a fun, experience-based curriculum which creatively integrates running. She is also a board member for the Education Advisory Committee at St. Mary’s

Though her focus has always been and will be education, she could not do what she loves without the support and love of her family. Her husband Ernest Vasquez is a Colonel in the U.S. Air Force Reserve currently serving on Active Duty in addition to being a Director of
Infrastructure in Technology Services at Northside ISD. They have 4 children, Matt, a Data Engineer, Josh, a student at The University of Texas at Austin, Maddie, a student at St. Mary’s University, and Bryson, a senor at Clark High School.

She is an avid runner having participated in the San Antonio Rock and Roll Half Marathon and local 5K’s.
Portrait of Associate Principal Christina Escarcega
Christina Escarcega - Associate Principal

The Associate Principal also serves as the Campus Behavior Coordinator. They can be reached by email at or by phone at (210) 398-2015.

My name is Christina Escarcega, I am proud to be the Boldt Mavericks Associate Principal. I have been in education for 12 years and 7 years in Northside. I have worked with students and teachers from ages Pre-k through 7th grade. I am proud to be part of the Boldt community.

I grew up in Sweeny, Texas, a small town on the gulf coast. My ambition brought me to San Antonio where I graduated from the University of Texas at San Antonio. I completed my Masters in Educational Leadership as a UTSA Roadrunner.

I am a boy mom to two sons, Daniel and Dominic. My husband and I are busy on weekends with sports activities and love every minute of it. I love to read and will read any chance I get.

My enthusiasm for learning and the success of students is what drives me to be the best.

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