Dennis Bruner works as a principal consultant who serves as an expert witness in issues involving a wide variety of medical devices including cardiothoracic surgery, dialysis, respiratory care, and labels/labeling. His work focuses on investigation, report writing, counseling, and expert testimony in a wide variety of medical device malfunctions and related cases. Prior to starting his own consulting firm, Bruner worked at Gambro Renal Products, Inc. as the director of quality and regulatory compliance from 1999 to 2001. 

In 1990, Bruner began working for COBE Cardiovascular, Inc. as the director of quality and regulatory affairs. A long history with COBE Laboratories, he worked in numerous roles from 1977 to 1990. Bruner holds a Bachelor of Science in mechanical engineering from Colorado State University and a Master of Science and a Doctor of Philosophy in mechanical engineering from the University of Houston. He also holds several U.S. patents in the field of oil well drilling and medical devices.