Meet the Directors
Please click on the following therapist to meet the directors
Dan Rootenberg
PT, DPT, CSCS
Co-founder and President, Licensed Physical Therapist, Strength & Conditioning Specialist, and ex-professional baseball player covered in numerous industry publications
David Endres
PT, MS
Co-founder and Clinical Director of SPEAR's 56th Street office, Licensed Physical Therapist, award-winning squash professional
Ryan Kitzen
PT, DPT
Clinical Director of SPEAR's 44th street location. Clinical Doctorate in Physical Therapy from Johns Hopkins University, ex-member of US national soccer team
Jaclyn Fehrenback
PT, DPT
Clinical Director of SPEAR's 84th Street location. Director of SPEAR’s Performance Running Program. McKenzie spine specialist. Competitive sprint triathlete.
Kelly Althaus
PT, DPT
Assistant Director of SPEAR's 56th St. location. Licensed physical therapist with a Doctor of Physical Therapy degree from Duke. Former Div I volleyball star.
Laura Muzzatti
PT, DPT
Clinical Director of SPEAR's new Chelsea location on W16th St. Licensed Physical Therapist with Doctorate from Columbia University. Former Women's Soccer Captain at Fordham.
Karen Poplavski
PT, DPT
Karen is a graduate of the University of Miami and received her Doctor of Physical Therapy from Emory University. Karen was a competitive swimmer in HS.
Maria Andrade
Practice Manager
SPEAR's practice manager. Fifteen years experience in healthcare administration. Graduated with a BA in hotel and restaurant management.