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Our Team

Our Team

Nathan D. Zasler, MD

Mark Bender, PhD


Barbara Kellogg

Jackie Bartenstein

Chef “Q” Derks

Colin Fisher

Kelly Fisher, CTRS

Bridget Murphy Gutzmer, DPT

Carrie Hartwell, PhD, LCSW

Emily Kavanaugh, LPN

Krysta Lacey

Kristin Lee

Eileen Lorenz

Beth Ann Norvell, MA CCC-SLP

Laura Schreffler, OTR/L

Shanna Thorpe, MS OTR/L

Akesa Tucker

Tamara Wootson



Tree of Life Staff

Key Personnel

Nathan D. Zasler, MD, FAAPM&R, FACRM, FAADEP, FAAPM, CBIST, CEO and Medical Director/Founder

Mark Bender, PhD, Clinical Program Director, Neuropsychologist

Barbara Kellogg, Administrative Program Director


Other Personnel

Jackie Bartenstein, Physical Therapy Assistant

“Q” Derks, Culinary Director

Colin Fisher, Neurobehavioral Rehabilitation Specialist

Kelly Fisher, CTRS, Therapy Department Manager

Bridget Murphy Gutzmer, DPT, Physical Therapist

Carrie Hartwell, PhD, LCSW

Emily Kavanaugh, LPN, Wellness Nurse

Krysta Lacey, Recreational Therapy Technician

Kristin Lee, Case Manager

Eileen Lorenz, Personal Trainer

Beth Ann Norvell, MA CCC-SLP, Speech Language Pathologist

Laura Schreffler, OTR/L, Occupational Therapist

Shanna Thorpe, MS, OTR/L, Occupational Therapist

Akesa Tucker, Therapy Aide

Tamara Wootson