Gary Alan Bass, MD MSc MBA FICS FEBS(Em Surg)

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Assistant Professor of Surgery at the Hospital of the University of Pennsylvania
Attending Surgeon and Intensivist, Hospital of the University of Pennsylvania, Penn Presbyterian Medical Center and Pennsylvania Hospital
Senior Fellow, Leonard Davis Institute for Health Economics (LDI), University of Pennsylvania, Philadelphia, PA
Division of Trauma Representative to UPHS Airway Safety Committee, UPHS Airway Safety Committee
Senior Scholar, Center for Perioperative Outcomes Research and Transformation (CPORT) at the University of Pennsylvania
Associate Program Director, Surgical Critical Care and Acute Care Surgery Fellowships, Division of Traumatology, Surgical Critical Care and Emergency Surgery
Director, Penn Trauma International Program, Division of Traumatology, Surgical Critical Care and Emergency Surgery, Department of Surgery
Medical Director, Surgical Intensive Care Unit, Pennsylvania Hospital
Associate Fellow, Center for Clinical Epidemiology and Biostatistics (CCEB) at the University of Pennsylvania
Director, Center for Emergency Surgical Outcomes Research (CESOR)
Faculty Search Advisor, University of Pennsylvania, Perelman School of Medicine, Department of Surgery
Department: Surgery
Contact information
Division of Traumatology, Emergency Surgery & Surgical Critical Care
3910 Powelton Avenue
Philadelphia, PA 19104
Office: 215-662-8819
Fax: 215-243-4679
Email: gary.bass@pennmedicine.upenn.edu
Publications

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Links
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Education:
BSc (Physiology)
University College Dublin, Dublin, Ireland, 2001.
 MSc (Physiology )
University College Dublin, Dublin, Ireland, 2005.
 MD (Medicine)
Royal College of Surgeons in Ireland, Dublin, Ireland, 2008.
 PgDip (Trauma Sciences)
Queen Mary, University of London, London, United Kingdom, 2016.
 PGCert (Healthcare Management)
University College Dublin, Dublin, Ireland, 2017.
 eMBA (Business Administration)
Quantic School of Business, Washington, DC, 2019.
 CCEB (Clinical Epidemiology and Biostatistics)
University of Pennsylvania, Philadelphia, PA, 2021.
 PhD (Surgical Sciences)
Orebro University, Orebro, Sweden, 2024.
Permanent link
 
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Description of Clinical Expertise

Surgical Critical Care, Emergency General Surgery, and Trauma Surgery

Description of Other Expertise

Google Scholar List of Publications: https://scholar.google.com/citations?hl=en&user=qjKBYO0AAAAJ&view_op=list_works&sortby=pubdate

Description of Research Expertise

Prospective multi-center observational cohort studies, randomized control trials and retrospective surgical outcomes observational studies in Emergency General Surgery, Surgical Critical Care and Trauma Surgery. Causal Inferential Methods. Clinical Epidemiology. Leveraging targeted trial emulation surgical outcomes research, as it intersects with mixed-methods implementation science to better inform data-driven clinician decision support and patient outcomes.

Selected Publications

Matteo Maria Cimino, Gary Alan Bass, Hayato Kurihara, Gabriele Bellio, Matteo Porta, Luigi Cayre, Shahin Mohseni, Matthew J Lee, Lewis J Kaplan and Isidro Martinez-Casas for the ESTES SnapSBO Group : Management and Outcome Variability in Hernia-Related Small bowel obstruction: Insights from SnapSBO. BJS Open September 2025 Notes: Corresponding Author.

 McLaughlin C, Kaplan LJ, Martinez-Casas I, Mohseni S, Cimino M, Kurihara H, Lee MJ, Bass GA.: Initial adhesive small bowel obstruction management pathway drives infectious complication occurrence. Surg Infect (Larchmt) 26(7): 561-567, Sep 2025.

 Martinez-Casas I, Kaplan LJ, Garcia Sánchez CJ, Pareja Ciuró F, Cimino M, Kurihara H, Lee MJ, Mohseni S, Bass GA; SnapSBO Collaborators.: Preoperative factors influence technique selection in surgical management of small bowel obstruction: findings from the SnapSBO multinational prospective observational study. Surg Endosc 39(9): 7652-7664, Sep 2025.

 Santos Carlin P, Coons M, Bele P, Kaplan LJ, Culkin M, Georges A, Jacovides CL, Martinez-Quinones P, Meaney D, Kauffman A, Smith D, Bass GA, Pascual JL.: Sex-related differences in cognition after severe murine traumatic brain injury: A Morris water maze study evaluating learning and memory. J Trauma Acute Care Surg 98(6): 883-891, Jun 2025.

 El Boghdady M, Hardie J, Brennan PA; TED Collaborative Group.: Theatre etiquette Delphi: the development of a guide on professional conduct and best practices in operating environments. Ann R Coll Surg Engl Jun 2025.

 Duffy CC, Lepore G, Bass GA, Abraham J.: A Systematic Review of Postoperative Care Transition Interventions: Examining the Implementation of Handoff Protocols and Checklists. Anesth Analg 140(5): 1030-1045, May 2025.

 Valcarcel CR, Bieler D, Bass GA, Gaarder C, Hildebrand F; ESTES Polytrauma Consensus Group.: ESTES recommendations for the treatment of polytrauma-a European consensus based on the German S3 guidelines for the treatment of patients with severe/multiple injuries. Eur J Trauma Emerg Surg 51: 171, Apr 2025.

 Kaplan LJ, Martinez-Casas I, Mohseni S, Cimino M, Kurihara H, Lee MJ, Bass GA; SnapSBO Collaborators.: Small bowel obstruction outcomes according to compliance with the World Society of Emergency Surgery Bologna guidelines. Br J Surg 112: znaf080, Mar 2025.

 Duffy CC, Kaplan LJ, Daly Guris RJ, Wahrman A, Baker PA, O'Sullivan E, Bass GA.: The Evolution of Emergency Front of Neck Access: A Historical Review. A A Pract 19: e01946, Mar 2025.

 Kemp Bohan PM, Tomita B, Duffy CC, Wallace SA, Leonard JM, Kaplan LJ, Bass GA.: Intra-operative consultation: The benefits and optimization of asking for second surgical opinions. Surgeon 23(1): 17-25, Feb 2025.
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Last updated: 10/06/2025
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