Gary Alan Bass, MD, MSc, MBA, PhD, FEBS (Em Surg)
Gary A. Bass, MD, MSc, MBA, PhD, FEBS (Em Surg) is a trauma and emergency surgeon, and intensivist with a focus on global surgery, implementation science, and data-driven quality improvement in acute care surgery and surgical critical care. He is an Assistant Professor of Surgery at the University of Pennsylvania’s Perelman School of Medicine and a Senior Scholar at the Center for Perioperative Outcomes Research and Transformation (CPORT).
Dr. Bass is internationally-recognized for his leadership in large-scale, multinational observational research in emergency general surgery, serving as Principal Investigator for the ESTES SnapSBO study, a time-bound prospective cohort study on small bowel obstruction management across Europe. His work bridges epidemiology, health services research, and surgical outcomes, integrating real-world clinical data with advanced statistical methodologies to identify practice variations, optimize surgical decision-making, and improve patient outcomes.
He is particularly interested in causal inference methods in surgical epidemiology, with a focus on instrumental variable analysis, latent class modeling, and target trial emulation to evaluate the effectiveness of non-operative strategies in emergency surgery. As Chair of the ESTES Research Committee, he has spearheaded snapshot audit methodologies that generate high-impact, collaborative research across multiple healthcare systems.
Dr. Bass’s work is supported by a strong foundation in health economics, biostatistics, and implementation science, and he actively collaborates with multidisciplinary teams to translate evidence into practice in both high-resource and resource-limited settings.
Content Area Specialties
- Emergency General Surgery & Trauma Surgery
- Global surgical epidemiology, practice pattern analysis, and outcomes research in emergency surgery
- Time-sensitive decision-making and optimization of non-operative management strategies
- Trauma and emergency surgery systems development in high- and low-resource settings
- Surgical Critical Care & Perioperative Medicine
- Intensive care outcomes in trauma and emergency surgery patients
- Integration of implementation science into critical care pathways
- Quality improvement and process optimization in perioperative and ICU settings
- Health Services Research & Data-Driven Quality Improvement
- Large-scale multinational observational cohort studies in emergency surgery
- Application of causal inference and advanced biostatistics to surgical outcomes research
- Real-world evidence generation through pragmatic clinical studies
- Implementation Science & Health Policy
- Closing the evidence-to-practice gap in emergency surgery and surgical ICU care
- Development of patient-reported outcome measures (PROMs) in surgical recovery
- Translation of surgical research into policy-level change
Methods Specialties
- Causal Inference & Observational Data Analysis
- Instrumental variable (IV) analysis, inverse probability weighting (IPTW), and propensity score methods
- Target trial emulation in surgical decision-making
- G-computation, marginal structural models (MSMs), and hierarchical modeling for multi-center data
- Multinational Cohort Study Design & Biostatistics
- Snapshot audit methodology in emergency surgery research
- Multicenter data harmonization and real-world evidence synthesis
- Bayesian and frequentist approaches to risk stratification and clinical prediction
- Implementation Science & Health Economics
- Frameworks for scaling evidence-based practices in surgical and critical care settings
- Cost-effectiveness analyses of surgical interventions and ICU care pathways
- Stakeholder engagement and mixed-methods evaluation of clinical interventions
- Geospatial & Network Analysis in Emergency Surgery
- Use of ArcGIS for mapping disparities in trauma and emergency surgery access
- Network modeling of international surgical collaboration and research impact