Our Team

Dr. Nick Sather co-founded Amphix Bio in 2019 and has led the company from the initial tech transfer through to pre-clinical development. He has 10+ years’ experience with Amphix Bio’s core technology platform, beginning with his PhD research in the Stupp Lab at Northwestern University.

Dr. Samuel Stupp is a Professor of Chemistry, Materials Science and Engineering, Medicine, and Biomedical Engineering at Northwestern University, where he also serves as the Director of the Center for Regenerative Nanomedicine. He has led academic research in nanoscience, biomaterials, and regenerative medicine for 40+ years, with numerous awards and recognitions for his work. He co-founded Amphix Bio based on the core technology platform developed in his laboratory over the course of two decades.

Dr. Hussain Sangji joined Amphix Bio in 2024 to lead strategic and operational initiatives. He was previously a Project Leader at the Boston Consulting Group (BCG), where he led engagements in strategy and operations at major global Biopharma and MedTech companies. He completed his PhD in the Stupp Lab at Northwestern University.

Dr. Charlotte Chen leads Amphix Bio’s R&D program. Her PhD research in the Stupp Lab at Northwestern University is incorporated into the company’s bone regeneration therapy. Prior to Amphix Bio, she worked at two biotechnology startups, where she focused on R&D, regulatory strategy, and IP research.

Dr. Iwona Maciagiewicz is an expert in synthetic organic and medicinal chemistry, with experience in R&D, cGMP, patent management, and agreement negotiations. She was previously an Invention Manager at INVO, a tech transfer office at Northwestern University. She has prior experience at four startups, including one she co-founded.

Dr. Wellington Hsu is a Professor of Orthopedic Surgery and Neurological Surgery at the Northwestern School of Medicine. He is a world-leading expert in minimally invasive procedures for spinal disorders. Dr. Hsu has received numerous awards for his clinical work and serves on several influential boards, including the Head, Neck, and Spine Medical Committee of the NFL.

Dr. Erin Hsu is a Professor of Orthopedic Surgery at the Northwestern School of Medicine. She is a leading expert in the molecular mechanisms of bone growth, with extensive experience developing in vitro and in vivo preclinical models for bone regeneration. She has collaborated with Dr. Stupp’s lab at Northwestern for over a decade to develop peptide materials for bone regeneration.

Dr. Dévora Grynspan is the Vice President for International Relations at Northwestern University and is also a co-founder, board member, and Secretary at Amphix Bio.

Chris Sollenberger holds BS/MS degrees from Northwestern University in Integrated Science and Biomedical Engineering. He completed his Master’s thesis in the Stupp Lab at Northwestern and now aids in materials characterization and medical image analysis at Amphix Bio. 

Daniel Allar is a Communications Specialist at Northwestern University and was previously a writer/editor for daily newspapers and trade publications covering the healthcare industry. He manages Amphix Bio’s website and assists with writing and proofreading various materials.