Colorado High School Home
Liz Feldhusen

Liz has worked at CHSC since 2011.  Liz got her Master’s Degree in School Counseling from Northeastern University and is currently working towards her EdS in Administrative Leadership and Policies Studies at  CU Denver.  Liz loves helping to direct policy at school that empowers youth to express themselves in authentic ways and grow academically and personally.  She got her undergraduate degree from Gettysburg College where she also played on the Women’s Soccer Team, and she currently coaches the CU Denver Women’s Club Soccer team.  In her free time, she enjoys practicing yoga, listening to live music, traveling and spending time with friends, family, and her dog, Lola.

Jason Heberer
Instructional Coach

I am excited to join the CHSC Osage Campus this year!  I have a wonderful wife Anne, a 2-year old daughter Kennedy, and a son Benjamin born this May!  I love my family, my faith, the outdoors and doughnuts!  I was born in Indiana, Pennsylvania but moved and went to 9 schools before graduating high school. Eventually, I graduated from IUP with a BA in Religious Studies and moved to Colorado to work as an outdoor educator for Outward Bound.  I also worked as a driver’s instructor before earning my teacher’s license from MSU. Deciding I’d like to affect change beyond my classroom, I earned a principal’s license from UCD in 2016.  My passion is for helping young people learn through adversity. 



Andy Glasgo
Special Education Coordinator

Andrew Glasgo took over thirty years to figure out what and where he wanted to be: a teacher in Denver. He earned his B.A. in English/Creative Writing from Ohio University and has been working on his M.A. in Special Education Curriculum and Instruction for six years. He grew up in a small town (like 300-people small) in rural Ohio, met his future wife in Ithaca, New York, learned to love the city (well, starter city) in Portland, Oregon, and is happy to call Denver his forever home since 2010. With five years of experience teaching here in Denver and seven years of experience in business-to-business sales and corporate training in OR and NY, he is passionate about his first year helping young adults at CHSC explore their interests and potential career paths, building the collaboration, entrepreneurial, and self-advocacy skills necessary in this expanding world. Glasgo loves hiking with Jamie, Avery, and Halsey, shooting hoops, especially with his nephew (who’s a little bit of a ball hog), parentheses, spending time with his large family, and reading, reading, reading.


Sandy Vasquez
Office Manager


I will be part of the Zumba/Dance class this 2016-17 school year and looking forward to seeing the student bring it!!

I was born in El Paso, Texas; Texas born Colorado raised! My parents moved our family to Denver when I was 8 years old because, there were not enough good job opportunities for them in Texas. I graduated from Skyview High School in Thornton, CO.

I am 100% fluent in Spanish so our Spanish speaking families and guests can count on an additional support in our office. I am a dedicated scholar support system and am always looking for ways to improve school culture both among staff and students and of course our Colorado High families! I am ecstatic to bring my enthusiasm to this team!

John Garrison
Math Teacher

Mr. Garrison attended Metro State University of Denver. Majoring in Mathematics with a Minor in Secondary Education. He did his student teaching at CHSC and ended up replacing the teacher who mentored him in the student teaching program. An outdoor enthusiast, Mr. Garrison enjoys snowboarding, golf, basketball, camping, hiking, and fly fishing –especially when it’s with his wife, Claire and loyal dog, Stella.  Mr. Garrison hopes to build mathematics skills in all his students to be better problem solvers. 

Jonathon Speese
Language Arts Teacher

Jonathon Speese is originally from Midland, Michigan. After attending The University of Michigan, he moved to Boulder to attend graduate school, where he fell in love with teaching. After school, Mr. Speese began working as an elementary math instructor at Centennial Elementary in Denver, but he's excited to be back in his favorite subject. In his free time, Mr. Speese enjoys golf, cooking, and--of course--reading

Tracie Trinidad
Student Advocate


Tracie, a Colorado native, comes to Colorado High School with seven years teaching experience internationally and locally, five years’ experience in curriculum development,  as well as three years’ experience in dropout prevention. Tracie earned her bachelor’s degree from New Mexico State University and her master’s degree from Regis University. Tracie is excited to build relationships with the students at CHSC and their support systems.

Khafilah Malik
Assistant Principal

Dr. Malik joins the Colorado High School Charter team as the Assistant Principal. She received her Doctorate of Education from West Virginia University in Curriculum & Instruction and her Masters of Arts in Education Administration & Supervision. She also holds a Masters of Arts in Interdisciplinary Studies from the Ohio State University as well as a Masters of Education from Towson State in Literacy.  Dr. Malik hails from Washington, DC and has spent numerous years working with students from a variety of diverse backgrounds. She enjoys challenging students to think critically and helping students succeed. She is looking forward to building relationship with students, teachers, the community and parents.

When Dr. Malik is not at work she enjoys spending time with her five- year old son, traveling watching Netflix, collecting rare African American Children’s books and playing Scrabble.

Tanaka Shipp
Concurrent Enrollment Counselor


Tanaka is originally from Byhalia, MS.  She relocated to Denver, CO five years ago to pursue a career in the non-profit sector and in that time she has been active in the community, working with local organizations such as the Chamber Connect Leadership Foundation Program, Annual Juneteenth Music Festival, 100 Men Who Cook Black Tie Gala and most recently participating in The Denver Metro Chamber's Impact Denver Leader Foundation Program.  Tanaka received her BA in Sociology from Jackson State University (JSU).  While at JSU she was selected as the first student to study abroad in Taiwan after spending the previous summer in Beijing, China as a part of the first faculty-led study abroad program.  Tanaka is also the proud co-founder of Denver's first African American women's philanthropic giving circle, Sisterhood of Philanthropists Impacting Needs, SPIN (  In her spare time she loves grilling and cooking for friends and enjoys golfing and thrift store shopping!

Amanda King
9th/10th Grade Team Lead
Math Teacher


Ms. King has been involved with education since the fall of 2009, but loves her role at CHSC more than any other. Her first undergraduate degree was in Arabic and Middle Eastern Studies, and she still maintains a deep love of the Arab world, the Arabic language, and all types of Arab tea and food! Her teaching career took her through Wyoming, Washington DC, Philadelphia, and finally to Denver, which she now lovingly calls home. As a teacher, she loves to explore social justice and help students harness mathematical skills and principles to become empowered problem solvers in their community. Most of all, she is a lifelong learner and loves to watch her students grow into bold learners as well! Ms. King loves to spend time with her son and partner, geek out over coffee and books, and spend time out in the sunshine or doing yoga.

Liz Cassity
Science Teacher

Ms. Liz Cassity is originally from Fort Walton beach Florida and moved to Tallahassee, Florida in order to attend the Florida State University. While there, she studied Biochemistry and found a love of teaching English as a second language, mostly inspired by her Sicilian family and background. In her free time she enjoys running, spending time with her fiance, and cooking (or discovering new places to EAT EAT EAT!). Ms. Cassity considers teaching and education one of her greatest passions and is so excited to be a part of the CHSC family!


Toby Nitschke
Electives Teacher

Mr. Nitschke began working in Denver as a counselor in a day treatment program but later transitioned to teaching a self-contained classroom. He has since taught English, Algebra, Social Studies and Spanish to middle and high schoolers, as well as chess, gardening, theater, survival skills, and beekeeping. He spent the last two years teaching art and literacy to adult inmates in jail and prison. He’s excited about the opportunity to teach electives at CHS Charter-- it’s a great fit that allows the opportunity of working with students in a variety of ways, teaching a variety of classes.


When he’s not at school, he enjoys puttering around in the backyard tending his garden, or taking his kids to the local park. His loves and hobbies include playing music, cartooning, writing, camping, climbing, tai chi and throwing horse shoes. He is married to a cool woman who happens to be a great cook and singer-songwriter (amongst other things). They have three girls who keep them busy and happy.

Julissa Torrez
Student Advocate


As the 9th-10th Grade Student Advocate, Julissa will work towards removing barriers for students to be successful as well as to empower students through multiple avenues.  Julissa has her Bachelor's in Psychology from the University of Phoenix. Julissa spends most of her free time being a mother of three or participating in community development.  Julissa has worked 13 years with multiple nonprofit programs in Northeast Denver to empower children of all ages to push past barriers for long-term success.

Rebeccah Winslow
Social Studies Teacher


Rebeccah Winslow grew up in many different places and came to Colorado by way of San Diego. She graduated from Colorado Mesa University with a History degree and headed down south to obtain her Masters of Education from the University of Mississippi. Ms. Winslow loves teaching Social Studies and the connections she can make to current events that makes history more relevant. When not teaching, Ms. Winslow likes to take her dog Luna on hikes, read Harry Potter, and watch Game of Thrones. Ms. Winslow loves cheering for the Ole Miss Rebels and the St. Louis Cardinals any chance that she gets. 

Fred Lewis 
Dean of Students

Dean Lewis received his Master’s Degree in Sports Administration at Kent State University.  He began working with students about 10 years ago. He attributes his accomplishments and success to the many people that saw something in him that he didn’t see.  They supported him on wanting more out of life than what he had in his current situation. As such, he hopes to pay it forward by establishing a career helping students that are capable of being successful but need the support and push.  When Dean Lewis is not working, you will find him playing basketball, weightlifting and hip hop dancing.   He enjoys sitting at aquariums and watching fish swim freely. He lives by the saying, “I consider my past perfect, because everything I have been through has made me who I am today!”

Sarah Sanniola
School Counselor

Sarah is the School Counselor at Colorado High School Charter.  She counsels all students in the areas of academic achievement, personal/social development and career development.  She guides today's students in transitioning from secondary school into the workforce or collegiate life.  She majored in Sociology and minored in Psychology, earning her Bachelors of Arts at the University of Colorado.  After attaining her Bachelors she attended Adams State University, receiving her Masters of Art in Counseling.  She grew up in a small coastal town in Oregon and moved to Colorado after high school.  She loves Colorado and everything it has to offer and can’t imagine living anywhere else.  She enjoys spending her time with her husband, their young daughter, their cats and also her friends.  She likes traveling, being outdoors, cooking and trying new foods.

Gabriel Neely 
11th/12th Grade Team Lead
Social Studies Teacher 

Mr. Neely is fortunate to have had many dynamic teachers in his life and credits this as a main reason for working in education. He also loves to learn and hopes to empower his students to think critically about the world. Mr. Neely has taught for several years at both the collegiate and secondary level and joined CHSC in August of 2015. Mr. Neely is passionate about travel, exploring cities and the wilderness alike, and while studying at the University of Wisconsin-La Crosse settled on Geography as a perfect Bachelor's degree. He later went on to receive a Masters of Education from that same institute. Mr. Neely moved to Colorado with his wife in 2014 from Wisconsin (yes, he loves  cheese - specifically aged gouda) and gets out to the mountains often to rock climb, downhill ski, and backpack. He also enjoys film, music, literature, and food and dabbles creatively as a guitar player, screenwriter, and cook. Fittingly, one of his favorites quotes is:  “I wish the whole world was dead serious about food instead of silly rockets and machines and explosives using everybody's food money to blow their heads off anyway.” from Jack Kerouac’s The Dharma Bums.

Andrew Ericson
Science Teacher


Andrew Mitchell Ericson is a professional archaeologist and cultural anthropologist with over a decade of practice in research and field capacities in academic, museum, corporate, and non-profit environments. Mr. Ericson has completed over 35 major archaeological projects across the United States and is specifically experienced in the excavation of stratigraphically complex sites. He currently serves as a Founding Director of Professional Certifications for Scientists.


In addition to his archaeological research, Mr. Ericson has consulted on issues of culture for public policy and non-profit purposes. In this capacity he has held the positions of Executive Director for I-WAKE Human Rights; elected Vice-President and President of the Colorado State Wraparound Coalition; Co-Chair of the Juvenile Justice League of Colorado; and Political Campaign Manager for races for Colorado State House District 44, Colorado State House District 39, and Denver City Council-at-Large.


Mr. Ericson believes that education is a public service and that quality scientific discovery is predicated upon rigorous standards applied consistently. It is this philosophy that guides his current work with Colorado High School Charter.

Mariano Senter
Language Arts Teacher

Mariano joined CHSC in 2015. He received his B.S. in Commercial Recreation at the University of Iowa in 1999.  He enjoys investing time and energy promoting well-read, free-thinkers.  Mariano enjoys family time with his two children, excursions on the bicycle Cadillac, digital audio workstation compositions and frozen Reese's Peanut Butter Cups.

Joshua Trinidad
Foundations of Success Teacher


Joshua Trinidad is the instructor for Foundational Skills at Colorado High School Charter. He is a graduate of the MEIS program at The University of Colorado at Denver with a focus in music performance, education and business. He has spent many years in the classroom as a public school educator as well as a public school administrator in Denver Public Schools. In 2009 he finished his Ed.M. at The University of Colorado at Boulder in Multicultural Education with a focus in Equity and Diversity through the BUENO Center. Joshua has been in education and youth development for nearly 15 years with a wide range of experience spanning from teaching overseas in South Korea and Mexico to consulting and developing educational programs all over Colorado. Joshua is also an adjunct professor in the School of Education at Colorado State University. He is currently finishing his PhD in Higher Education Leadership and Human Development at Colorado State University where his dissertation focus is on how youth, minoritized populations in urban settings access higher education, specifically music programs and the arts. He is also a full time musician actively performing, touring and recording around the world with multiple musical groups both locally and in Europe.