Our Team

Leadership Team

President & CEO
Heidi Heissenbuttel, MA ECSE

Vice President of Programs
Katie Peters Greer, PT

Vice President of Development
Maribeth Waldrep

Development Manager
Paige Heagle

Media Inquiries
Patricia Smith, OnTarget PR

Program Coordinators

Enrollment Coordinator
Kerry Armbruster

Tina Myrsiades, MA ECSE

Kara Schneit, CCC SLP

Janet Barrows, LCSW

Denver Great Kids Head Start

Disabilities Services Coordinator
Jenny Lujan, OTR

Program Coordinator
Cristina House, MA ECSE

Board of Directors

Sewall Child Development Center is governed by a committed group of Board Members who provide ongoing professional guidance and support to the organization.

Board Chair Jonathan Lurie
SecretaryWilliam C. Holland
Treasurer Randall Sylvan
Ex-Oficio Chair – Marc Kleiner

Board Members
Sarah Allen
Barbara Bieber
Tara Bohle
Charon Earnest

Chuck Fish
Linda Kanan, Ph.D.
Cathy Mauer (on hiatus)
Karen Possehl
Gretchen Shaffer, MSW
Carlyn “Lynn” Stambaugh
Ashley Walker

Gene Koelbel, In Memoriam

Sewall Board Member for over 60 years

Gene Norgren Koelbel served Sewall’s mission for more than 60 years. Gene Koelbel’s parents connected her to Sewall’s legacy as they began support in the 1940s. Gene and her parents spearheaded the development and construction of Sewall’s first clinic facility at 1360 Vine Street in the early 1960s, and together with Sewall’s board and capital campaign committee, worked together to move Sewall to the expanded school facility at 940 Fillmore Street. As her health waned in the past year, Gene’s membership on the Program Committee remained steadfast. The committee moved their meetings to her house so she could still participate! Gene and Walt Koelbel’s support has touched each and every corner of Sewall. Their support of Fragile X research as it began with Dr. Randi Hagerman (now of the MIND Institute in California) put Sewall’s Diagnostic & Evaluation Clinic on the map. Her support of Sewall’s mission as it evolved from a therapeutic mobility clinic to a nationally recognized inclusionary education resource is unparalleled.

Gene, you will be forever missed and appreciated.


Gene Koelbel

Gene Koelbel and her daughter Lynn, both long-term Sewall Board members, pictured at Sewall’s 2016 Graduation- the first class to graduate in Sewall’s new headquarters at 940 Fillmore Street. The following year, Sewall’s Board of Directors voted unanimously to christen the new facility as “The Koelbel Building” in honor of Gene and her late husband Walt.