1. Critical Role of Physiologist John A
Critical Role of Physiologist John A. Johnson in the Origins of Minnesota’s Billion Dollar Pacemaker Industry 
Vincent L. Gott, MD 
The Annals of Thoracic Surgery 
Volume 83, Issue 1, Pages (January 2007)
DOI: /j.athoracsur
Copyright © 2007 The Society of Thoracic Surgeons Terms and Conditions

2. Fig 1
Dr John A. (Jack) Johnson, Professor of Surgical Physiology at the University of Minnesota School of Medicine. (Courtesy of Mrs. John A. Johnson.)
The Annals of Thoracic Surgery  , DOI: ( /j.athoracsur )
Copyright © 2007 The Society of Thoracic Surgeons Terms and Conditions

3. Fig 2
Dr C. Walton Lillehei with a young postoperative patient displaying his transistorized Medtronic pacemaker. (Courtesy of Medtronic, Inc, Minneapolis, Minnesota.)
The Annals of Thoracic Surgery  , DOI: ( /j.athoracsur )
Copyright © 2007 The Society of Thoracic Surgeons Terms and Conditions

4. Fig 3
Earl E. Bakken, Cofounder of Medtronic, Inc. (Courtesy of Medtronic, Inc, Minneapolis, Minnesota.)
The Annals of Thoracic Surgery  , DOI: ( /j.athoracsur )
Copyright © 2007 The Society of Thoracic Surgeons Terms and Conditions