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Sierra Linda High School
Tolleson Union High School District

Meet Our Staff

We are proud of the exceptional faculty and staff here at Sierra Linda High School. They are a dedicated group of men and women who truly care about helping students succeed. Please meet the faculty and staff who work every day to help students excel.

A Parent's Right to Know

As a parent of a student at Sierra Linda High School, you have the right to know the professional qualifications of your child's teachers. Please read A Parent's Right to Know.


Tim Madrid
(623) 474.7702
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Jim Kramer
Assistant Principal; Athletics
(623) 474.7721
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Tramane Marshall
Assistant Principal; Registration
(480) 474-7712
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Lorin Sempkowski
Assistant Principal; Instruction
(623) 474.7802
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Christina Valenzuela
Assistant Principal; Discipline
(623) 474.7731
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Jennifer Vidrio
Admin Assistant; Principal
(623) 474.7702
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Staff by Department

To find a staff member by department, please click on the appropriate button.