Martin Arrowsmith, M.D. scientist and leading character

Leora Tozer Arrowsmith Martin’s first wife

Dr. Max Gottlieb professor of bacteriology and true scientist

Dr. Terry Wickett Martin’s associate in scientific research

Madeline Fox to whom Martin at one time is engaged

Joyce Lanyon Arrowsmith Martin’s second wife

Gustaf Sondelius colorful Swedish physician and lecturer

Doc Vickerson who first inspired Martin to want to study medicine

Professor Edward Edwards head of department of chemistry

Dr. Norman Brumfit instructor in English

Dr. T. J. H. (“Dad”) Silva dean of the medical school

Dr. John Aldington Robertshaw professor of physiology

Dr. Oliver O. Stout professor of anatomy

Dr. Lloyd Davidson professor of materia medica

Dr. Roscoe Geake professor of otolaryngology

Dr. Loiseau professor of surgery

Dr. Horace Greeley Truscott president of the university

Reverend Ira Hinkley desirous of becoming a missionary

Clif Clawson the class jester

Angus Duer brilliant, hard-driving valedictorian of his class

“Fatty” Pfaff the butt of many crude jokes

Irving Watters a serious second-year medic.

Mrs. Fox Madeline’s mother

Nelly Byers probationary nurse, friend of Leora

“Dr.” Benoni Carr a charlatan

Dr. Rouncefield head of the Chicago clinic

George F. Babbitt Zenith real estate king

Dr. Entwisle a youngish physiologist from Harvard

Dawson Hunziker president of Hunziker pharmaceutical firm

Mrs. Gottlieb peasant wife of the great scientist

Robert Gottlieb their worthless son

Miriam Gottlieb their faithful daughter

Another Gottlieb daughter (unnamed) who eloped with a gambler