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A team of technologists and leading arthroscopic surgeons


Business, ML, and engineering leadership

Ray Rahman

Ray Rahman

CEO, Founder

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Paul Gabos

Paul Gabos

Chairman of the Board

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Chandra Jonelagadda

Chandra Jonelagadda

Head of Research & Innovation

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Dr. Richard Angelo, MD, PhD

Dr. Richard Angelo, MD, PhD

Chief Medical Officer

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Himawan Gunadhi, PhD

Head of Kaliber Asia

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Madison Jellins

Madison Jellins, JD

Chief Legal Officer

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Mark Ruiz

Mark Ruiz

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VP of Engineering

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Rithesh Punyamurthula

VP of Business Operations

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The United States’ leading arthroscopic surgeons

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Ryan Barban

Dir. of Clinical/Surgical Applications

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The United States’ leading arthroscopic surgeons

Anthony Romeo

Anthony Romeo, MD

Exec. VP, Musculoskeletal Institute, Dupage Medical Group • Chief medical editor, Orthopaedics Today  Past president, American Shoulder and Elbow Society

Brian Cole, MD

Brian Cole, MD

Vice-chairman & managing partner, Midwest Orthopedics at Rush Team physician, Chicago Bulls, Chicago White Sox, Chicago Fire, Chicago Dogs, and DePaul University

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Nicholas Sgaglione, MD

Professor & Chair, Northwell Health Dept. of Orthopedic Surgery • Sr VP of Orthopedics & Exec. Dir. of Northwell Health Orthopaedic Institute • Past President AANA • Past Chair, Arthroscopy Journal Board of Trustees


Robert Burks, MD

Professor of Orthopedic Surgery & Robert W. Metcalf Presidential Endowed Chair in Orthopedic Surgery, University of Utah • 2016 Thomas A. Brady Award • Authorship of 100+ articles on orthopedic sports medicine • Co-Chair, Metcalf Meeting, 2014-2017

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John Sperling, MD

Professor of Orthopedic Surgery, Mayo Clinic • Walter Reed Distinguished Achievement Award, 2014 • Charles S. Neer Award, 2003 • Author of 260+ peer-reviewed publications.

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Richard L. Angelo, MD

Past president, AANA • AANA Education Foundation board of directors • Institute for Surgical Excellence advisory board

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Mark Getelman, MD

Current president, AANA • Designated master arthroscopist • Faculty member, SCOI Sports Medicine Division • Co-director, SCOI Sports Medicine Fellowship

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Patrick Denard, MD

One of leading shoulder surgeons in North America • Clinical instructor, Oregon Health & Science University • Co-author of two arthroscopic shoulder textbooks

Shariff K. Bishai, DO, MD

Past president AOAO, Sports Section • Fellowship trained, sports medicine, complex shoulder and knee reconstruction


Deryk Jones, MD

Section Head of Sports Medicine & Cartilage Restoration, Ochsner Sports Medicine Institute • Chief Resident, Massachusetts General Hospital • Harvard Combined Orthopaedics Residency Program • Shoulder surgery and sports medicine fellowship, University of Pittsburgh

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Matthew Pifer, MD

Fellowship-trained in Orthopedic Sports Medicine • Institutional Review Board (IRB) Member,  Sport and Spine Rehab Clinical Research Foundation  • Active member of AAOS, AANA, AOSSM

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Dr. Amon Ferry

Fellowship-training in Sports Medicine • Knee and shoulder specialist  •  Consultant to professional sports teams, including Seattle Mariners, Arizona Diamondbacks, Arizona Cardinals • AAOS, AANA, AOSSM

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William Ciccone, MD

Sports Medicine & Joint Replacement specialist • Designated Master in Shoulder Arthroscopy, AANA • Past Team Physician for the Colorado Rockies AAA Sky Sox

Kotaro Yamakado, MD, PhD

Chief Consulting Orthopaedic Surgeon, Fukui General Hospital • International member, AANA • Associate Editor, JSES: Seminar in Arthroplasty • Editorial board, Journal of Orthopaedic Science; Asia-Pacific Journal of Sports Medicine, Arthroscopy, Rehabilitation and Technology • Richard J. O’Connor Research Award, AANA 2018

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Joseph Burns, MD

Shoulder Surgery Specialist •  Head of Orthopedics at Wellstar Health Systems • Master Instructor in Arthroscopy, AANA • Clinical Instructor,
Wellstar’s Orthopedic Residency Program

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Scott Sigman, MD

Sports Medicine, Knee & Shoulder Specialist • Opioid Sparing Surgery • Medical Device Development • Fellow, World Society of Sports & Exercise Medicine • Fellow, Royal College of Surgeons Ireland

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Robert Meislin, MD

Orthopedic Sports Medicine, NYU Langone Orthopedic Center • Professor of Orthopedic Surgery, NYU • Editorial board member, Journal of Arthroscopy

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Gary Poehling, MD

Editor in chief emeritus, Arthroscopy: The Journal of Arthroscopic and Related Surgery • Past president, ISAKOS • Professor, Wake Forest (orthopedic surgery)

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Nathan Mall, MD, CIME

Fellowship trained in sports medicine, advanced shoulder and knee arthroscopy • Specializes in regenerative and biologic medicine

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Brian Waterman, MD

Former military orthopedic surgeon specializing in sports medicine, cartilage restoration • AANA advanced arthroscopy fellowship

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Ira Guttentag, MD, FACS

Medical director and head team physician for the Tampa Bay Lightning •  Board of directors for Florida Medical Clinic

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Ryan Pitts, MD

President, Orthopedic Associates, LLC in St. Louis, MO

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Lyndon Gross, MD, Ph.D.

Team Orthopedist, St. Louis Cardinals * Specialist in sports medicine, reconstruction and restoration

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David King, MD

Leonard Marmor Foundation Award • Associate master instructor at AANA Hip Arthroscopy Course

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Brian Feeley, MD

Chief of Sports Medicine and Shoulder Surgery, UCSF • AOSSM and OREF Young Investigator Awards

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Matthew Stiebel, MD

Knee and shoulder specialist. Associate Master Instructor, AANA.
• Associate Clinical Professor, FAU Medical School.

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Stanley Rogers, MD

Chief of General Surgery, UCSF • Director of video endoscopic surgery, Zuckerberg San Francisco General Hospital

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Tony Gallagher, PhD

Director of research, ASSERT Centre, University College Cork

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Robert Gallo, MD, MHA

Orthopedic sports medicine, Penn State Hershey • Professor, Penn State College of Medicine • Associate program director, Penn State Orthopaedic Residency Program

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Victor Khabie, MD, FAAOS, FACS

Chief of surgery, Northern Westchester Hospital • Chief of sports medicine, Northern Westchester Hospital • Co-director of Orthopaedic & Spine Institute, Northern Westchester Hospital


Steve Hamilton, MD

University of Cincinnati College of Medicine • Orthopaedic Surgery residency, Emory University • Sports medicine and shoulder reconstruction fellowship, Steadman-Hawkins Clinic of the Carolinas


Rodney Comisar MD

Sports Medicine • Vice President of OrthoNeuro in Columbus, Ohio • Clinical Instructor at the Ohio University College of Osteopathic Medicine • Team physician at Denison University for 20 years


Sean McMillan, MD

Chief of Orthopedics, Virtua Willingboro Medical Center • Assistant Professor of Orthopedic Surgery, Rowan University • Team physician, Boston Red Sox organization

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Doug Freedberg, MD

Orthopaedic Surgeon, Arizona Sports Medicine Center • Team orthopedic surgeon, Arizona Cardinals • Consultant, Oakland Athletics • Team physician, Phoenix Suns


Amir Moinfar, MD

Clinical Assistant Professor of Orthopedics, University of Maryland • Advanced fellowship training in shoulder surgery and sports medicine, Duke University Medical Center • Assistant team physician, Duke University


Bryan Reuss, MD

Orthopedic Sports Medicine Specialist,  Orlando Orthopaedic Center • Past Assistant Team Physician, Cincinnati Bengals, University of Cincinnati Athletics, Cirque du Soleil, ATP Tennis, USA Rugby and the Arnold Palmer Invitational • AOSSM, AANA, ATAF, AAOS

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Atul Kamath, MD, MBA

Professor of Orthopedic Surgery, Cleveland Clinic • Director of Center for Hip Preservation • Fellowship training in hip and knee reconstruction, Mayo Clinic and Mueller Europe • Fellowship in Health Policy, AAHKS • Cleveland Clinic Innovation Lead for Orthopedics, and Global Vice Chair for Quality, Safety & Patient Experience

* Surgeon Advisory Board members are Kaliber shareholders.

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