Unsupported Browser
The American College of Surgeons website is not compatible with Internet Explorer 11, IE 11. For the best experience please update your browser.
Close
Member ID
Become a Member
Open Search
Menu
ACS Home
My Dashboard
Donate to the foundation
About Us
Advocacy & Policy
Quality Programs
For Medical Professionals
For Patients
Become a member and receive career-enhancing benefits

Our top priority is providing value to members. Your Member Services team is here to ensure you maximize your ACS member benefits, participate in College activities, and engage with your ACS colleagues. It's all here.

Become a Member
ACS Home
My Dashboard
Donate to the foundation
Quality Programs
For Medical Professionals
For Patients
Advocacy & Policy
About Us
Become a member and receive career-enhancing benefits

Our top priority is providing value to members. Your Member Services team is here to ensure you maximize your ACS member benefits, participate in College activities, and engage with your ACS colleagues. It's all here.

Become a Member
Popular searches
Frequent searches
ACS
ACS Fellow Since 2000

John H. Marks, MD, FACS

Board Certification

  • American Board of Colon and Rectal Surgery
  • American Board of Surgery - General Surgery

Society Memberships

  • Am Soc of Col& Rec Surg
  • Soc for Surg Alim Tract
  • Assn for Acad Surg
  • Soc of Surg Oncol
  • Soc of Am Gast End Surgs
  • Am Medical Association

Additional Information

Gender

Male

Colon-Rectal Surgery

100 E Lancaster Ave

Medical Science Building Suite 375

Wynnewood, PA 19096

United States

Contact Information

Phone:610-645-9093
Administrative Assistant
Name:Colleen Pechter
Email assistant

Subspecialties and Areas of Clinical Concentration

Anorectal Disease

  • anal abscess
  • anal fissure
  • anal fistula
  • anal sphincter repair
  • anal tears
  • anal warts
  • anorectal malformations
  • hemorrhoid problems
  • hemorrhoidal banding
  • IRC (infrared coagulation) for hemorrhoi
  • pruritus ani
  • rectal bleeding
  • rectal prolapse
  • recto-vaginal fistula
  • sphincter repair

Colon and Rectal Disorder/Procedures

  • colectomy
  • colon polyps
  • colon surgery
  • colonoscopy
  • colostomy
  • diverticular disease
  • diverticulitis
  • flexible sigmoidoscopy
  • ileostomy
  • intussusception
  • laparoscopic colon surgery
  • Meckel's diverticulum
  • pelvic floor dysfunction
  • peritonitis
  • pilonidal disease
  • removal of colon polyps
  • sigmoidoscopy
  • small bowel syndrome
  • surgery for diverticulitis

Colon and Rectal Cancer/Tumors

  • anal cancer
  • colon cancer screening
  • colon surgery
  • colon/rectal cancer
  • colonic polyps
  • colostomy
  • ileostomy
  • intussusception
  • laparoscopic colon surgery
  • Meckel's diverticulum
  • peritonitis

Gastrointestinal

Colon and Rectal Other

Vaginal-Rectal Disorders/procedures

  • rectocele
  • rectovaginal fistula

Bowel Control

  • bowel incontinence
  • constipation
  • diarrhea
  • incontinence, fecal

Inflammatory Bowel Disease

  • Crohn's disease
  • ulcerative colitis

Minimal Invasive/Endoscopic Procedures

  • colonoscopic polypectomy
  • colonoscopy
  • endoscopic surgery
  • flexible sigmoidoscopy
  • laparoscopic surgery for colon and recta
  • laser surgery
  • minimally invasive surgery

Hospital Appointments

Lankenau Hospital

Attending

Academic Appointments

Lankenau Institute for Medical Research

Professor

Hahnemann

Clinical Assistant Professor

University of Nice, France

Adjunct Professor

09/2011—Present