Ascentx Medical

Restoring quality of life.


Juerg Tschopp


Juerg F. Tschopp has served as Chief Technical Officer and CEO for Stratum Medical Corporation from 2004 to 2005 and from 2009 to present. From 2005 to 2008, Dr. Tschopp served as the General Manager of MediPlant GmbH, Frankfurt (Germany), where the PMMA microsphere manufacturing process for the first and only FDA-approved permanent injectable wrinkle filler ArteFill® was developed. During the same time, Dr. Tschopp also held the position of Director for Research and Development at Artes Medical Inc., a medical technology company that developed ArteFill®. From 1997 to 2003, he served as the Senior Director of Research and Development at Integra Life Sciences Corporation; Integra offers innovative solutions, including leading plastic and regenerative technologies, in specialty surgical solutions, orthopedics and tissue technologies. Prior to Integra, Dr. Tschopp served in various research capacities at BACHEM AG, a leading manufacturer of synthetic GMP peptide for commercial drug manufacturing, at Telios Pharmaceuticals, Inc., at Calbiochem Corporation, at the Salk Institute Biotechnology Industrial Associated, Inc. (SIBIA, Inc.). In 1974 Dr. Tschopp earned his Master of Science degree in Organic Chemistry, and in 1979 his PhD in Biophysical Chemistry at the University of Basel, Basel (Switzerland). From 1979 to 1983 Dr. Tschopp conducted post-doctoral studies with Dr. Randy Schekman (2013 Nobel Prize Laureate) at the University of California, Berkeley. In 1992, Dr. Tschopp earned his MBA degree from San Diego State University.

Ralph Mattern


Dr. Mattern served as the Principal Scientist for Artes Medical, Inc. from 2006-2008. He was responsible for the implementation of a large-scale production of FDA-quality standard PMMA microspheres for the first and only FDA-approved permanent injectable wrinkle filler, ArteFill®. Prior to Artes, Dr. Mattern was employed by Integra Life Sciences Corporation as a Senior Research Scientist from 1998-2004, and at NEOMPS as the Director of GMP peptide production. Following his employment at Artes, Dr. Mattern served as a Principal Scientist from 2008-2013 for Tornier, developing medical devices for orthopedic surgery, and most recently has been a consultant for several biomedical companies. In 1993, Dr. Mattern earned his Ph.D. in Organic Chemistry from the University of Ulm, Germany, following postdoctoral assignments at Harbor Branch Oceanographic Institute and the University of California, San Diego, as a sponsored post-doctoral fellow of the Deutsche Forschungsgemeinschaft (DFG).



Timothy Malaney has served as Director of Quality for San Diego, California-based Stratum Medical Corporation from January 2009 to present. From April 2005 to November 2008, Mr. Malaney served as the Quality Control Manager and Senior Research Scientist for Artes Medical Inc., a medical technology company that developed ArteFill®, the first and only FDA-approved permanent injectable wrinkle filler. At Artes, he was responsible for testing and analysis of collagen and polymethylmethacrylate (PMMA) products. From 1995 to 2005, he served as the Research Scientist, Protein and Peptide Chemistry for Integra Life Sciences Corporation; Integra offers innovative solutions, including leading plastic and regenerative technologies in specialty surgical solutions, orthopedics, and tissue technologies. Prior to Integra, Mr. Malaney served in various research capacities at Agouron Institute and Scripps Clinic and Research Foundation. In 1984, Mr. Malaney earned his Bachelor of Arts degree in Chemistry from the University of California, San Diego.

Corbett Stone

CORBETT W. STONE, BS Mech. Eng. (PMMA-Collagen Injection Devices)

Corbett brings over 25 years of medical device engineering experience and a deep clinical background to AscentX. He has consulted for our team since 2001 and brings a unique entrepreneurial perspective with focus on IP management. Corbett has an outstanding track record of successful new product developments and market launches and is named on over 97 U.S. patents and over 120 patents worldwide. His successful engineering career includes prior positions at U.S. Surgical Corp. (Director of R&D), NuVasive, Inc. (Co-founder & VP R&D), California Medtech, Inc. (Director Minimally Invasive Systems), Vessix Vascular, Inc. (Co-Founder & CTO), Implicitcare, LLC (VP Engineering & CTO), DePuy Synthes (Director of Product Development Inter-Operative Neuro-Monitoring), Cadwell Industries, Inc. (Product Manager, Inter-Operative Neuro-Monitoring), and Asonian Medtech, LLC (President).

Corbett holds a BS degree in Mechanical Engineering from the University of Bridgeport, CT (USA).

David Pudwill

David Pudwill

David Pudwill has served as a Senior Director of Regulatory Affairs at ConvaTec from 2018 to 2021, and before that as a Director of Regulatory Affairs and Quality Assurance at ConvaTec from 2017 to 2018. David is a founding member of the Kidney Health Initiative (a partnership between FDA and ASN). He has helped startups acquire funding and achieve successful IDE and 510(k) submissions to FDA. David held various roles at FDA from 2008 to 2017, including Branch Chief of the Implantable Electrophysiology Devices Branch, Lead Medical Device Reviewer in the Gastroenterology and Renal Devices Branch, and Congressional Affairs Specialist in FDA’s Office of Legislation. Prior to joining FDA, David worked at St. Jude Medical from 2006 to 2007 supporting the Cardiac Rhythm Management Division. David earned his Bachelor of Science in Engineering degree in Biomedical Engineering from Case Western Reserve University in 2006, and earned his Master of Mechanical Engineering degree from Johns Hopkins University in 2014.