Leadership Team

Brain Injury


Diane Schirmer, M.Ed. - Corporate Director of Brain Injury Services.
Schirmer holds a M.Ed. degree from Stephen F. Austin University with a background in education and psychology. She has specialized in acute care, residential, home and community-based programs for more than 25 years. She completed her initial training in brain injury at The Institute for Rehabilitation and Research in Houston, a leading rehabilitation hospital, where she was part of a TBI Model System and federal grant projects. Schirmer has served on several state and national committees to advocate on behalf of individuals with brain injury and developed the state guidelines manual for school re-entry following brain injury for Texas and Oklahoma. During her tenure at the Brown Schools and as a national committee member, Schirmer developed curriculum for substance use and brain injury. She has held key leadership positions in post-acute rehabilitation including VP of Clinical Services for Neurorestorative Specialty Centers and Program Director/Quality and Compliance Manager for the Hope Network. Schirmer is a CARF surveyor and as she holds a deep appreciation for the infrastructure supporting a clinical program. As a national committee member, Schirmer identifies best practices in outcomes measurement for post-acute brain injury. She serves as a member of the Special Interest Group for the American Congress of Rehabilitation Medicine.


Darryl L. Kaelin, M.D. - Medical Director
Dr. Kaelin is board certified by the American Board of Physical Medicine and Rehabilitation. He is the Medical Director of the Frazier Rehabilitation Institute in Louisville where he manages patients with neurological trauma. Dr. Kaelin is the Chief of the Division of Physical Medicine and Rehabilitation and an Associate Professor in the Dept. of Neurological Surgery at the University of Louisville. Dr. Kaelin is also Program Director for the Physical Medicine and Rehabilitation Residency Program.

Dr. Kaelin has published widely in peer-reviewed journals on brain injury medical management, pharmaceutical treatments, spasticity and service reimbursements.

He has led numerous, non-published medication trials sponsored through pharmaceutical funding. He has delivered presentations at national and international conferences in the areas of spasticity treatment, pharmaceutical use in brain injury and medical practice management issues. He is President Elect of the American Academy of Physical Medicine and Rehabilitation.

Dr. Kaelin obtained his undergraduate degree from the University of Notre Dame, earned his medical degree from the University of Louisville School of Medicine and completed his specialty training at the Medical College of Virginia.

Prior to assuming his current positions with the University of Louisville and Frazier Rehabilitation Institute, Dr. Kaelin spent six years as the Medical Director of the Acquired Brain Injury Program at Atlanta’s Shepherd Center, a catastrophic care hospital for people with spinal cord and brain injuries. While at the Shepherd Center, he also served as Medical Director of Brain Injury Research and Clinical Associate Professor of Physical Medicine & Rehabilitation in Emory University School of Medicine.

Previously, Dr. Kaelin served for 10 years as the Medical Director of Brain Injury Rehabilitation at the Hook Institute in Indianapolis, where he managed patients with neurological trauma.


Intellectual and Developmental Disabilities


Sarah Bell - Regional Director of Operations
Bell holds a MSW from the University of Kentucky and is a Certified Social Worker. Her undergraduate degree is in Anthropology & Sociology from Transylvania University. Bell has held a variety of positions during her 12 years in social work, ranging from case manager to program director for Supports for Community Living waiver services. As the sibling of an individual with an intellectual disability, Sarah has a passion for seeing individuals with intellectual and developmental disabilities achieve their dreams.


Della Tuttle - Chief Intellectual and Developmental Disabilities Officer
Tuttle has spent her professional career working in human services. For 24 years, she has applied her talents in a variety of settings including; community behavioral health, juvenile justice, children’s services and intellectual and developmental disabilities services. Tuttle holds a B.A. in Counseling and Rehabilitation and a M.A. in Counseling from Marshall University.


Melissa Willoughby - Director of Quality Improvement
Willoughby earned a Bachelor of Social Work degree from Eastern Kentucky University. She has been on staff with New Vista for 12 years. During that time, she began her career as a case manager before being promoted to case management supervisor. Following her time as a case management supervisor, she served the organization as a service area manager before assuming her current role. Willoughby participates in advocacy events for individuals with intellectual and developmental disabilities throughout the community to raise awareness of client needs and concerns.