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Meet Our Team

We are an incredibly passionate group of leaders, doctors, innovators, and experts in value-based care, technology, healthcare, orthopedics, physical therapy, sports medicine, and data analytics.

The Limber team is focused on making science-driven, engaging, and easy-to-follow exercise therapy as widely accessible as possible, and empowering individuals with musculoskeletal conditions to achieve long-term functional well-being.


Michael Gruner

Chief Executive Officer

Previously consulting with Accenture, repeat founder, passion for co-founding Limber originated from his experience with chronic back pain

Nirav Modi

Chief Operating Officer

Experienced healthcare executive, 20+ years background in technology, product, and operational excellence

Ramon Castro

Chief Technology Officer

Experienced CTO in digital health, 10+ years of technology leadership

Jake Grundstein, PT, DPT, MS, MBA

Vice President, Clinical Operations & Value-Based Care

Previously with Hospital for Special Surgery (HSS), MS in Health Care Transformation at UT Austin

Micah Cowsik-Herstand

Principal Engineer

15+ years as a full-stack software engineer. Professional actor/singer/dancer. Previously with CareSignal.

Sejal Gajarawala, PT, DPT, MBA

Director, Client Success & Clinical Strategy

Healthcare leader and advocate for innovative patient-centered care

Robyn Keene

Director, Marketing

Health and wellness marketing leader, Previously managed global marketing for multi-brand life sciences organization

Julia Goodwin

Director, Outcomes Strategy

10 years of Clinical Management, Previously managed a MSK QCDR focused on Outcomes Collection & Patient Engagement

Steven Liska, PT, DPT, ATC, CSCS

Director, Sales

Doctor of Physical Therapy, previous sales experience with one of the nation’s largest medical supply companies

Bryn Bonner PT, DPT, CSCS

Director, Physical Therapy

Doctor of Physical Therapy and Master’s Degree in Anatomy and Clinical Health Science, with a background in strength and conditioning

Jeff Burgin

Sr. DevOps Engineer

8+ years of Development and Infrastructure experience, with a background supporting Healthcare organizations

Evan Kuhl, PT, DPT

Senior Manager, Client Success

Doctor of Physical Therapy

April Neukam, PT, DPT

Clinical Operations Lead

Experienced Physical Therapy clinic owner and operator, Doctor of Physical Therapy

Board of Directors

Michael Gruner

Co-Founder and Chief Executive Officer, Previously consulting with Accenture, repeat founder

Dr. Marc Gruner

Co-Founder and Senior Advisor, Value-Based Care and Medical Policy, Mayo Clinic-trained Sports Medicine Physician, MBA

Dr. Emir Sandhu

Managing Director of the Blue Venture Fund, Faculty at Stanford University, MD from Harvard Medical School, MBA from Harvard Business School

Lloyd Mandell

Managing Director, Technology and Business Services Sector Head at Glenview Capital, 25+ years of public and private market investment management experience.

Rick Gawenda, PT

National leader in PT & OT billing and compliance, Founder and President of Gawenda Seminars & Consulting, Previously President of the Section on Health Policy & Administration of the APTA and President of the Michigan Association of Medical Rehabilitation Program Administrators


Scott Serota

Former President and CEO of BlueCross BlueShield Association

Lili Brillstein

Previously led Value-Based Care Programs at Horizon Blue Cross Blue Shield

Fiona Gathright

Former CEO of Wellness Corporate Solutions

Joseph Giles

Former President of Third Largest Physical Therapy Group in the U.S.

Nathan Hogaboom, PhD

Research Scientist at Kessler Foundation at the Centers for Spinal Cord Injury Research and Outcomes & Assessment Research