Home Office Staff
Click on a name to send an email to a staff member.
Clark Callahan 
Executive Director 
720-305-8516

Mr. Callahan has a deep passion to help all young people realize the value, freedom, and the responsibility that comes with education.  Mr. Callahan received his B.S. in Communications and Economics from University of Northern Colorado, an MBA from Fairfield University and an Ed. M in Urban Educational Administration from Columbia. Bringing 12+ years of experience working in education, he has the drive to move CHSC from a Red school in 2013, to an orange in 2014, to a Green school by 2017. When Mr. Callahan is not at school, you will find him enjoying a medium rare cheese burger with sweet potato fries and a soft and chewy chocolate chip cookie with a little vanilla ice cream on top. A dedicated family man, Mr. Callahan values every moment he gets to spend with his loving wife and three beautiful children. Mr. Callahan also enjoys running, skiing, hiking, knitting, sewing, and painting.

Sarah Marin
Director of Finance and Human Resources
303-892-8475, Ext. 2103

Sarah has been working at CHSC since 2006.  She is a CPA with an accounting degree from the University of Denver and an MBA from the University of Michigan.  Originally from Puerto Rico, Sarah grew up in Wisconsin and Missouri before coming to Denver for college.  Sarah enjoys traveling, hiking, rafting, gardening and spending time with her family and friends.  In 2019 she completed her goal of visiting all 50 states!

Osage Campus and Home Office

1175 Osage St.

Denver, CO 80204

Tel: 303-892-8475

Fax: 303-362-6994

GES Campus:

3093 E. 42nd Ave.

Denver, CO 80216

Tel: 720-524-8664

Fax: 303-955-0027

www.coloradohighschoolcharter.com

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