IBD specialists

geert-dhaensGeert D’Haens

Geert D’Haens was appointed as head of the AMC-IBD Unit in December, 2010 and Professor of Inflammatory Bowel Diseases at the University of Amsterdam.
He is an internist and gastroenterologist trained at the university of Leuven and the University of Chicago, USA.
Geert D’Haens specialized in inflammatory bowel disease already early in his career and presented his doctoral thesis in 1996 on ‘early postoperative recurrence of Crohn’s disease’. From 1999 till 2011 Geert D’Haens created and led the Imelda GI Clinical Research Centre at the Imelda general hospital in Bonheiden, Belgium, where many new medications for inflammatory bowel disease and colorectal cancer have been investigated. D’Haens was the president of the Flemish Society of Gastroenterology from 2007 to 2011 (www.vvge.be) and co-founder and now honorary member of the European Crohn’s and Colitis Organization ECCO in 1999 (www.ecco-ibd.eu). As a thought leader in IBD worldwide, he is currently chairman-elect of the International Organization for Inflammatory Bowel disease IOIBD (www.ioibd.org) and director of Robarts Europe (www.robartsclinicaltrials.com), an academic clinical research organization with headquarters in Canada devoted to the study of IBD. He has published over 250 scientific papers, so far.

cyriel-ponsioenCyriel Ponsioen

Cyriel Ponsioen was trained as Internist at the VUmc from 1989 to 1995. Thereafter he trained as gastroenterologist at the AMC from 1995 till 1998. In 2000 he defended his doctoral thesis on Etiological and Clinical Studies in Primary Sclerosing Cholangitis. From 2000-2006 he worked as consultant gastroenterologist in Ter Gooi Ziekenhuizen and the Isala Clinics. In 2007 he was appointed senior staff member at the Department of Gastroenterology & Hepatology at the AMC. The focus of his clinical as well as research activities lie in IBD and PSC. The former mainly focusses on microbiota research in IBD. As for PSC, he has built up a research line in epidemiology and disease course, and he leads a research line looking into the relationship between the gut and the biliary tree.  Cyriel Ponsioen represents the AMC in the ICC, the Dutch Initiative for Crohn’s and Colitis, and is chair of the clinical working group of the International PSC Study Group.
Since June 5th 2018 dr. Ponsioen was appointed professor in Gastroenterology & Hepatology, specifically for inflammatory bowel and biliary tract diseases.

mark-lowenbergMark Löwenberg

Mark Löwenberg is a gastroenterologist trained at the Academic Medical Center (AMC) in Amsterdam, The Netherlands. He is specialized in inflammatory bowel diseases. In 2000 Löwenberg obtained scientific experience at a biotechnology company in the Netherlands (Crucell, nowadays part of Johnson & Johnson). In that same year he performed a research internship at Harvard Medical School (Dana Farber Cancer Institute, Boston, USA). After finishing medical school, he started in 2003 his PhD at the AMC. His research dealt with defining the interactions between cellular signaling pathways in immune cells and therapeutic interventions in inflammatory bowel diseases. He received his PhD degree in 2006. Löwenberg started his training at the AMC in 2006 and completed his fellowship in gastroenterology in March 2012. During his fellowship he spent a three-month period at the Gasthuisberg in Leuven, Belgium. As a clinician Löwenberg is involved in patient care, clinical trials and translational research.

Krisztina Gecse

In 2004 Krisztina Gecse graduated summa cum laude from the University of Szeged, Hungary, where she was trained as an internist and gastroenterologist. During her promotion she spend fifteen months in the INRA-El Purpan in Toulouse with Prof. Lionel Bueno. In 2012 she was promoted on her thesis: The Role of Gut Permeability and Serine-proteases in the Pathomechanism of Irritable Bowel Syndrome and Inflammatory Bowel Diseases. Since then Krisztina specialized in treatment for patients with inflammatory bowel disease, first in the Academic Medical Center as fellow, and from 2013 till 2017 she worked as a member of staff in the gastroenterology department at the Semmelweis University in Budapest. Krisztina Gecse was president of the Hungarian Society for Young Gastroenterologists and she is now a member of the Clinical Committee from the European Crohn and Colitis Organization ECCO (www.ecco-ibd.eu). In May 2017 she was appointed as member of staff at the gastroenterology department of the AMC. Her focus in IBD will be on perianal disease for Crohn’s disease, recurrence of disease after surgery for Crohn’s disease, pregnancy and IBD, and transition from child care to adult care. She is furthermore involved in research that focusses on better and personalized care for treatment of IBD.

Marjolijn Duijvestein

Marjolijn Duijvestein was trained as a gastroenterologist specialized in inflammatory bowel disease at the Academic Medical Center (AMC) in Amsterdam from 2013 to 2018. In 2012 she obtained her PhD at Leiden University with a thesis entitled: ‘Mesenchymal Stem Cells in Inflammatory Bowel Disease’. During her specialization she gained experience at the University of California San Diego (UCSD, USA) and she did an internship at Robarts Clinical Trials (www.robartsclinicaltrials.com), an academic research organization dedicated to drug development for IBD. Within the IBD, Dr. Duijvestein is engaged in clinical and translational research. Her focus is on the care surrounding the transition from childhood to adults, research in pouchtis and improving the care for the individual patient.