Colorectal Surgeons

Special clinical interests:
- Abdominal wall hernia: including complex and recurrent
- Colonic conditions: cancer, inflammatory bowel and diverticular disease
- Anorectal Conditions (haemorrhoids, skin tags, perianal fistula, fissures)
- Gallbladder diseases: gallstones
- Pilonidal Disease
- Endoscopy: Colonoscopy and Gastroscopy
- Minor surgery: Skin lesions, lumps and bumps
Current Employment
General Surgeon, Waikato Public Hospital
Qualifications
- MBChB (Otago, 2005)
- FRACS (General Surgery, 2015)
Memberships
- NZAGS
Post Fellowship Training
- Trauma and General Surgery, Waikato Public Hospital and Royal Melbourne Hospital (2016 – 2017)
I am a Southern Cross Affiliated Provider

Current practice
- Laparoscopic cholecystectomy
- Laparoscopic hernia repair
- Laparoscopic colon and rectal surgery
- Pelvic floor surgery for incontinence and emptying difficulties
- Haemorrhoids: latest ligasure banding treatment, excisions
- Anal skin tag excisions, pilonidal surgery, fistula and fissure surgeries
- Endoscopy: colonoscopy, gastroscopy and flexible sigmoidoscopy
Qualifications
- FRACS (1995)
- MBChB (Otago 1985)
I am a Southern Cross Affiliated Provider

Jesse completed his medical degree at the University of Otago before undertaking general surgical training around New Zealand. After attaining FRACS in general surgery he subsequently completed three years of sub-specialty training in colorectal surgery on the Australia and New Zealand Training Board in the Colon and Rectal Surgery programme. During this time he received the CSSANZ Phil Douglas Award for best paper by a colorectal fellow, completed a research thesis on the management of rectal cancer, gained experience in peritonectomy and HIPEC at the Queen Elizabeth Hospital in Adelaide and exposure to pelvic exenteration surgery at the North Shore Hospital in Auckland. He maintains a broad colorectal surgical practice.
At Waikato Hospital Jesse manages acute (emergency) general surgical conditions as well performing elective (planned) surgery with a focus on colorectal disorders. He is heavily involved in medical student education and co-ordinates the trainee intern attachment in general surgery. He lives in Matangi with his wife Andrea and 3 daughters.
Areas of Expertise
- Colorectal cancer
- Inflammatory bowel disease (Crohn’s disease, ulcerative colitis)
- Diverticular disease
- Anorectal disorders including anal fistulae, haemorrhoids, fissures
- Pilonidal disease
- Rectal bleeding assessment and management
- Pelvic floor dysfunction including rectal prolapse and obstructive defecation
- Colonoscopy (accredited colonoscopist for National Bowel Screening Programme) and gastroscopy
- Hernia repair
Current Employment
Consultant Colorectal and General Surgeon, Waikato Hospital
Senior Lecturer in Surgery, University of Auckland
Qualifications
MBChB
MMedSc (Distinction)
FRACS (General Surgery)
Memberships
- Fellow Royal Australasian College of Surgeons
- Member of New Zealand Association of General Surgeons
- Member of Colorectal Surgical Society of Australia & New Zealand (CSSANZ)
- Member of American Society of Colon and Rectal Surgeons
- Member of Colon and Rectal Surgery Section, Academic Surgery Section RACS
Research
Jesse maintains an academic appointment at the University of Auckland and has a strong interest in surgical research and education. He has published many peer-reviewed papers that can be accessed at the following link:
Training
- Colorectal Research Fellow, University of Otago Christchurch (2018)
- Colorectal Fellow, The Queen Elizabeth Hospital, Adelaide SA (2019)
- Colorectal Fellow, North Shore Hospital, Auckland (2020)

Nick maintains a broad practice of General and Colorectal surgery but has a strong focus on minimally invasive surgery (keyhole). He enjoys teaching and is a faculty member on several courses run by the Australasian College of Surgeons.
Areas of Expertise
- Colonoscopy and Gastroscopy
- Colorectal cancer
- Surgery for inflammatory bowel disease (Crohn’s and Ulcerative Colitis)
- Anorectal conditions (rectal bleeding, haemorrhoids, fistulas, fissures, AIN, pilonidal)
- Pelvic floor dysfunction (including rectal prolapse, obstructive defaecation)
- Treatment of faecal incontinence including Sacral Nerve Stimulation
- Trans-Anal Minimally Invasive Surgery (TAMIS)
- Diverticular disease
- Hernia repair
- Gallstones
Current Employment
Consultant Colorectal and General Surgeon, Waikato Hospital
Qualifications
MBChB
MBChB (Distinction)
FRACS (General Surgery)
Memberships
- Fellow Royal Australasian College of Surgeons
- Member of New Zealand Association of General Surgeons
- Member of Colorectal Surgical Society of Australia & New Zealand (CSSANZ)
Research
Nick maintains an active interest in research and has published in peer review journals and presented at international conferences on topics related to Colorectal surgery.
Training
- Colorectal Fellow Waikato Hospital 2017
- Colorectal Fellow St Vincent’s Hospital Melbourne 2018
- Colorectal Fellow Christchurch Hospital 2019

Mr Mark Omundsen is a General/Colorectal, laparoscopic and endoscopic surgeon with a particular interest in colorectal and pelvic floor disorders. After completing the Australasian Surgical fellowship (FRACS) in 2009 he successfully applied to the Colorectal Society of Australia and New Zealand (CSSANZ) subspecialty colorectal fellowship program. He spent the next two years obtaining subspecialist expertise in the field of colorectal surgery and successfully completed the fellowship program in 2011.
Mark is especially interested in the use of minimally invasive surgical approaches such as laparoscopic, single incision laparoscopic surgical (SILS) and trans-anal minimally invasive surgical (TAMIS) techniques in the management of colorectal diseases, abdominal wall herniae and gallbladder pathology.
His subspecialty interests include surgical management of colon and rectal cancer, inflammatory bowel disease, rectal prolapse and defaecatory disorders such as incontinence and obstructive defaecation. He takes an active part in research programmes at Tauranga Hospital, and has published widely in the fields of both general surgery and colorectal surgery. He regularly attends international conferences to stay up to date with modern management of colorectal disorders.
Mark is fully accredited with the New Zealand conjoint committee for the performance of both upper (gastroscopy) and lower (colonoscopy) gastrointestinal endoscopy.
Mark moved to the beautiful Bay of Plenty with his wife and 3 children in 2012 He works as a specialist surgeon at both Tauranga Public Hospital and Grace Hospital, managing a wide range of general and colorectal pathologies. He is actively involved in junior surgeon training at the public hospital, and has a mentoring role for junior doctors (intern supervisor).
Qualifications
- Bachelor of Human Biology (Auckland).
- Bachelor of Medicine and Bachelor of Surgery (Auckland)
- Fellow of the Royal Australasian College of Surgeons.
- Graduate of the Chapter of Perioperative Medicine (GChPOM)
Area of expertise:
- Endoscopy
- Hernia
- Gallbladder
- Colorectal
- Pelvic Floor
- Endometriosis
Current Employment:
- Consultant Colorectal/General Surgeon at Tauranga Hospital
- Consultant Colorectal/General Surgeon at Grace Private Hospital Tauranga.
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