Meet the Staff
The dedicated professionals behind FORE's research, education, and outreach mission.
CEO
Derek Pupello, MBA
Chief Executive Officer
Derek Pupello has been working for the foundation since 2002. As a research manager, he managed several clinical research projects including an FDA investigational device exemption multi-center study of the first reverse shoulder arthroplasty system in the United States. The Reverse Shoulder Prosthesis®, invented by Mark Frankle, MD, was FDA approved in 2005. Derek became Director of Clinical Research in 2006 and became CEO of FORE in 2007. In his time at FORE, he has co-authored 27 publications including 7 articles published in the Journal of Bone and Joint Surgery.
When Derek started in 2002, the Foundation was primarily engaged in clinical research. After becoming CEO, he worked to expand FORE's capabilities to include Biomechanical Research, Surgical Training, and Continuing Medical Education (CME). He helped build a biomechanical research lab on the premises and converted storage space into FORE's first Surgical Training Center, completed in 2010 with capacity for up to 20 stations and a state-of-the-art audiovisual system.
He currently serves as Affiliate Associate faculty in the Orthopaedic Surgery Residency Program, Orthopaedics and Sports Medicine Department, University of South Florida School of Medicine.
For a list of publications, powered by PubMed, click here. Curriculum Vitae
Continuing Medical Education
Lexi Betances
Director, Continuing Medical Education
Richelle Lopez
Program Manager
Harley Murray
CME Coordinator
Isabella Mighell
Program Coordinator
Director of Research
Peter Simon, PhD
Director of Research
Formerly the Senior Lead Scientist in the biomechanics division, Peter Simon works as the Director of Research at FORE where he has been employed since August 2012. Dr. Simon holds courtesy Professorship appointments at the University of South Florida Morsani College of Medicine and the Department of Chemical and Biomedical Engineering.
Peter completed his Ph.D. at the University of Illinois at Chicago and his Masters degree at the Technical University of Kosice, Slovakia. He joined FORE for post-doctoral training with a primary focus on shoulder biomechanics and became a full-time staff scientist in 2014. His primary area of expertise is quantification and assessment of shoulder anatomy and pathology from both basic and clinical science perspectives.
Peter has authored more than 30 peer-reviewed publications, multiple book chapters, and has over 50 podium or poster presentations at national and international conferences. He currently serves as leader of the multicenter study group within the Society of American Shoulder and Elbow Surgeons, aiming to better diagnose and treat osteoarthritis in the shoulder joint.
Biomechanical Research
Miguel Diaz, MS
Biomechanics Research Laboratory Manager
Miguel Diaz heads the Biomechanics Research Laboratory at FORE, working closely with FOI surgeons, fellows, residents, and industry leaders. Miguel began at FORE in 2011 as a biomechanics research intern, focused on shoulder, spine, and hip biomechanics. He became a full-time Research Assistant in 2015 and has since co-authored more than 25 peer-reviewed publications with numerous poster and podium presentations at national and international conferences.
Miguel completed his B.S. in Chemical Engineering from the University of South Florida in 2012 and his M.S. in Biomedical Engineering from the University of Florida in 2015. Outside of FORE, he enjoys spending time with his wife and kids, playing music, soccer, cycling, running, motocross, weightlifting, and tinkering with 3D printing.
Sergio Gutierrez, PhD
Senior Biomechanics Scientist
Sergio Gutierrez began working at FORE in May of 2001 as a part-time Research Assistant while completing his Bachelor's degree at the University of South Florida. Through his research in biomechanics, Sergio was instrumental in furthering the understanding of reverse shoulder arthroplasty and in helping to alter surgical technique to improve patient outcomes. He has numerous publications in peer-reviewed journals and is currently an Affiliate Associate Professor at the USF Medical School.
Sergio received his B.S. in Chemical Engineering and Biology from USF in 2002 and his Ph.D. in Biomedical Engineering from USF in 2009. His hobbies include running, biking, kayaking, flying, playing tennis, and developing iPhone software.
For a list of publications, powered by PubMed, click here.
Michael Walchko, BS
Research Engineer
Michael holds a Bachelor's Degree in Mechanical Engineering from the University of Central Florida. Growing up in a household rooted in both nursing and engineering, he developed a strong interest in biomechanics from an early age. Outside of his professional pursuits, he enjoys staying active through exercise and relaxing through video games.
Clinical Research
Debbi Warren, RN, CCRC, ACRP-CP
Clinical Research Operations Manager
With over 20 years of experience as a Clinical Research Coordinator, Debbi currently serves as Clinical Research Operations Manager at FORE. As a Certified Professional from ACRP and an RN with over 40 years of experience in peri-operative nursing, she brings a deep understanding of patient care and surgical research. She has a passion for mentoring new clinical research coordinators and helping them grow into their roles.
Outside of work, Debbi's greatest joy is spending time with her family, traveling, and caring for her beloved Dobermans. She also enjoys yoga, cooking, and exploring new cuisines.
Viki Sochor, MS, CCRC
Clinical Research Coordinator
Viktoria's journey began with a Master's degree in Europe and a move to the U.S. in 2007, leading her from sales and logistics to the world of orthopaedic research. An ACRP-certified clinical research coordinator with over a decade of experience, Viki is driven by the desire to improve patient outcomes through effective clinical research. She specializes in sports medicine research and loves witnessing the impact of clinical studies on patient care. Proud mother of three, she cherishes time spent with her family.
Tantien Nguyen, BS
Clinical Research Coordinator, Hand & Upper Extremity
Meet Tantien Nguyen, who goes by Andy — a nickname that originated from a restaurant in his hometown of El Dorado, Arkansas. Andy completed his undergraduate studies at the University of South Florida in 2021. As the primary point of contact for the Hand & Upper Extremity department, Andy has built a well-organized research environment where residents, fellows, and medical students engage in clinical trials and produce meaningful research.
Outside of work, Andy enjoys spending time with his fiancée Tien and their corgi, Rice, and appreciates great food and house music.
Maria Lemus
Clinical Research Coordinator, Spine
Fellowship Coordinator, Spine
For nearly a decade, Maria has dedicated her career to advancing clinical research, beginning as a Patient Recruiter in 2015 and growing into her current role as Clinical Research Coordinator. Her background spans Research Assistant and Pharmacy Technician roles, giving her comprehensive, hands-on experience across all study phases. She specializes in ethical participant recruitment, data quality, regulatory compliance, and investigational drug protocols.
Away from work, Maria enjoys baking and cooking with her daughter Elena, exploring authentic cuisines with her partner Alexander, attending live music, and recharging on regular trips to Mexico.
Anne Meredith Baldy, MS
Clinical Research Coordinator, Adult Reconstruction
Anne Meredith is a third-generation Floridian, born and raised in South Tampa. She earned a bachelor's degree in Mathematical Sciences from Clemson University and a Master's in Medical Sciences from the University of South Florida. During graduate school, she worked at Northside Hospital in St. Petersburg and later developed her research skills at USF and Tampa General Hospital before joining the FORE team.
In her free time, Anne Meredith enjoys being with her family, playing tennis, practicing yoga at CAMP, and exploring new books, music, and local restaurants.
Clinical Outcomes & Data
Kaitlyn N. Christmas, BS, CCRC
Manager, Patient-Reported Outcomes Systems
Research & Fellowship Coordinator, Shoulder & Elbow
Kaitlyn Christmas started as an intern in the Phillip Spiegel Orthopaedic Research Laboratory in 2013 and transitioned into Shoulder and Elbow Clinical Research in 2015, taking over the division in 2016. Kaitlyn maintains a Shoulder Arthroplasty database of over 5,000 surgeries and a large repository of corresponding intraoperative videos. She has co-authored more than 30 publications and remains an active part of the FOI/FORE Shoulder and Elbow Fellowship curriculum.
Kaitlyn received her B.S. in Biopsychology, Cognition, and Neuroscience from the University of Michigan in 2013 and her CCRC designation from ACRP in 2018. Outside of work, she enjoys spending time with her husband Christian, her children Olivia and Tristan, their two dogs, reading, cooking, sports, and winning trivia nights.
Shoshana Newman, BS
Clinical Outcomes Data Coordinator
Shoshana Newman is a Clinical Outcomes Data Coordinator at FORE. She grew up in Tampa and graduated from the University of South Florida with a degree in Biomedical Sciences and a minor in Psychology. She especially enjoys the math- and science-driven aspects of her work.
Outside of work, Shoshana loves trying new sports and is excited to begin hockey lessons. She also enjoys spending time with her cat, Cannoli, and exploring new places with friends and family.
Marketing & Development
Arielle Estrill-Sherman, BS
Marketing and Fundraising Coordinator
Arielle Estrill-Sherman is the Marketing and Fundraising Coordinator at FORE. She began her journey with FORE as the Administrative Fundraising and Marketing Intern, where she developed strong skills in event coordination and social media strategy. She now supports FORE's mission by leading marketing initiatives, coordinating fundraising efforts, and strengthening community outreach to advance orthopaedic research and education.
Arielle recently graduated from the University of South Florida with a degree in Health Sciences, with a concentration in Health Administration and a minor in Sociology. She also brings a clinical background with experience as a Pharmacy Technician and Certified Nursing Assistant. Outside of work, she enjoys playing pickleball, running with her husky Suka, power yoga, and traveling.
Research Advisory Board
Alfred V. Hess, MD
Orthopaedic Surgeon, Hand & Upper Extremity
Dr. Alfred Hess is an orthopedic surgeon specializing in disorders of the upper extremity, including shoulder, elbow, and hand surgery. He began his practice with Florida Orthopaedic Institute in March 1995. He graduated from the University of Cincinnati College of Medicine in 1985, completed his residency at the University of Pittsburgh, and completed fellowship training in Hand and Microvascular Surgery at the University of South Florida.
Dr. Hess is board certified by the American Board of Orthopaedic Surgery with a Certificate of Added Qualification in Hand Surgery. He is the current director of the FOI Hand and Upper Extremity Fellowship Program and Director of Hand Surgery at USF.
John M. Small, MD
Orthopaedic Surgeon, Spine
Dr. Small is board-certified by the American Board of Orthopaedic Surgery and fellowship-trained in Spine Surgery. Since 1996, he has treated patients seeking cervical, thoracic, and lumbar spine care. With advanced training in endoscopic and microscopic surgery, Dr. Small maintains many ongoing clinical research projects and serves as an Associate Assistant Professor at the USF Department of Orthopaedics. He has been named a Best Doctor of America every year since 2005.
Dr. Small's personal interests include running, biking, and participating in triathlons.
Mark A. Frankle, MD
Orthopaedic Surgeon, Shoulder & Elbow
Dr. Frankle has been with Florida Orthopaedic Institute since 1991 and received his fellowship training at Mayo Clinic in Rochester, Minnesota. He is the surgeon responsible for bringing reverse shoulder arthroplasty to the United States, pioneering a lateralized center of rotation design now mirrored by every major orthopaedic implant manufacturer. He holds numerous patents on implants and has authored more than 200 peer-reviewed articles, including a published textbook on reverse shoulder arthroplasty.
Dr. Frankle serves on the Executive Board of the Society of American Shoulder and Elbow Surgeons and directs the FOI/FORE Shoulder and Elbow Fellowship Program, which has trained over 70 alumni. His work has received the prestigious Charles S. Neer Award for Basic Science from the American Academy of Orthopaedic Surgeons.
Neil S. Kumar, MD, MBA
Orthopaedic Surgeon, Sports Medicine
Dr. Kumar received his undergraduate degree at Lehigh University and his medical degree from Drexel University College of Medicine. He completed his residency at Drexel University, where he served as chief resident, and completed an Adult and Pediatric Sports Medicine Fellowship at the University of Connecticut. He is board-certified by the American Board of Orthopaedic Surgery.
Dr. Kumar's special interests include arthroscopic minimally invasive surgery, knee ligament repair and reconstruction, cartilage restoration, and shoulder instability. In his spare time, he enjoys spending time with his wife Bhumi and their two children, Niam and Ava.
Thomas L. Bernasek, MD
Orthopaedic Surgeon, Adult Reconstruction
Dr. Bernasek was fellowship-trained in adult reconstruction and a founding member of Florida Orthopaedic Institute. He received his medical training at Creighton University College of Medicine and completed his Orthopaedic Residency at the University of New Mexico, followed by a fellowship in joint replacement at the Mayo Clinic in Rochester, Minnesota.
Known nationally and internationally as an expert in joint replacement, Dr. Bernasek's research was published in numerous professional journals and presented at conferences worldwide. He served as an Associate Professor in Orthopaedic Surgery at the USF College of Medicine and as President of the Hillsborough County Medical Association. His lasting contributions to research, education, and patient care continue to shape FORE's work.