After studying Medicine and Biophysics at the University of Leipzig he started his career as a surgeon at the St.Georg-Hospital Leipzig. Based on a research grant he started in 1989 a research project on precursor examination during protein synthesis at Cornell University in New York. After his return to Germany, he started to introduce laparoscopic bariatric surgery in Frankfurt at the Northwest Hospital. He became a professor of surgery at the Goethe University of Frankfurt. He was head and director of the Hospital Sachsenhausen in Frankfurt from 2001-2014. Until 2006 more than 50 % of bariatric surgeries were performed in this first COE in Germany. In October 2014 the first and largest clinic for Metabolic surgery (42 beds) in Sana Hospital Offenbach was founded. Since 1998 he has been organizing the Frankfurt meeting as the largest live-surgery meeting for bariatric surgery.
Prof. Weiner founder and president of the German Society for Surgery of Obesity and Metabolic Disorders, president of the European Chapter of IFSO, president of the IFSO World Congress 2011 in Hamburg with the first invitation of IBC-Club, president of IFSO 2014-2015.
He received many awards and prizes (Virchow, Thiersch, Sauerbruch, Pichlmayr and others), the IFSO poster prizes in 2006 and 2013 and became an Honorary member of ASMBS in 2016 and other national societies.
He performed during the 4 decades more than 12.000 bariatric procedures and published more than 400 scientific papers, 10 books and more than 20 book chapters.
Prof. Weiner is Associate Editor of Obesity Surgery and Member of the Editorial Board of SOARD and 8 other scientific journals.
Selected publications from PubMed
An international multidisciplinary consensus statement on laparoscopic liver biopsy.
Lei SY, Han Y, Rockey DC, Alswat K, Wong VW, Jumaev N, Toro-Huamanchumo CJ, Taha S, El-Kassas M, George J, Muthiah M, Ghanem O, Yoneda M, Hang DV, Sebastiani G, Papatheodoridis G, Abu-Abeid A, Robertson AG, Kim SH, Weiner R, Mahawar K, Shabbir A, Kermansaravi M, Rajan R, Seki Y, Taskin HE, Shikora S, Oliveros E, Parmar C, Cheng Q, Thaher O, Ruiz-Úcar E, Oviedo R, Ribeiro R, Musella M, Ramos AC, Ryu SW, Abdelbaki T, Lee WJ, Chan MP, Garcia Flores JE, Skinovsky J, Madkhali A, Weiner S, Tacke F, Yang W, Neuberger J, Zheng MH, International Obesity Society Working Group on Steatotic Liver Disease
Cell Rep Med. 2026 Jun 16;7(6):102831 doi: 10.1016/j.xcrm.2026.102831.
One anastomosis gastric bypass in children and adolescents: An international expert survey.
Kermansaravi M, Chiappetta S, Musella M, Carbajo MA, Kassir R, Chevallier JM, Gawdat K, Kular KS, Prager G, Weiner R, Shikora SA, Parmar C, Expert Collaborative Group
Clin Obes. 2025 Oct;15(5):e70018 doi: 10.1111/cob.70018.
International expert consensus on surgery for type 2 diabetes mellitus.
Kermansaravi M, Omar I, Finer N, Le Roux C, Carbajo MA, Sarwer D, Busetto L, Ponce J, Logue J, Parretti HM, O'Kane M, Shahabi S, Khunti K, Blakemore AI, Stenberg E, Abbott S, Alqahtani A, Aminian A, Amr B, Balibrea JM, Batterham RL, Behrens E, Bhatt DL, Chesworth P, Chowbey P, Clare K, Neto MG, Graham Y, Goel R, Hanif W, Herrera MF, Kasama K, Kassir R, Knop FK, Kothari SN, Kristinsson JA, McGowan B, McKechnie A, Miller K, Miras AD, Morton J, Ogden J, Peterli R, Pinkney JH, Pournaras D, Pouwels S, Prager G, Salminen P, Serlie MJ, Shabbir A, Singhal R, Taheri S, Tahrani AA, Weiner R, Shikora SA, Mahawar K
BMC Endocr Disord. 2025 Jul 1;25(1):151 doi: 10.1186/s12902-025-01961-w.
Metabolic and Bariatric Surgeon Criteria-An International Experts' Consensus.
Kermansaravi M, Chiappetta S, Shikora SA, Musella M, Kow L, Aarts E, Abbas SI, Aly A, Aminian A, Angrisani L, Asghar ST, Bashir A, Behrens E, Billy H, Boza C, Brown WA, Caina DO, Carbajo MA, Chevallier JM, Clapp B, Cohen RV, Jazi AHD, De Luca M, Dilemans B, Fried M, Gagner M, Neto MG, Garneau PY, Gawdat K, Ghanem OM, Al Hadad M, Haddad A, ElFawal MH, Herrera MF, Higa K, Himpens J, Husain F, Kasama K, Kassir R, Khoursheed M, Khwaja H, Kristinsson JA, Kroh M, Kurian MS, Lakdawala M, LaMasters T, Lee WJ, Madhok B, Mahawar K, Mahdy T, Almomani H, Melissas J, Miller K, Neimark A, Omarov T, Palermo M, Papasavas PK, Parmar C, Pazouki A, Peterli R, Pintar T, Poggi L, Ponce J, Prasad A, Pratt JSA, Ramos AC, Rezvani M, Rheinwalt K, Ribeiro R, Ruiz-Ucar E, Sabry K, Safadi B, Shabbir A, ShahabiShahmiri S, Stenberg E, Suter M, Taha S, Taskin HE, Torres A, Verboonen S, Vilallonga R, Voon K, Wafa A, Wang C, Weiner R, Yang W, Zundel N, Prager G, Nimeri A
Obes Surg. 2024 Sep;34(9):3216-3228 doi: 10.1007/s11695-024-07395-y.
Revision/Conversion Surgeries After One Anastomosis Gastric Bypass-An Experts' Modified Delphi Consensus.
Kermansaravi M, Chiappetta S, Parmar C, Carbajo MA, Musella M, Chevallier JM, Ribeiro R, Ramos AC, Weiner R, Nimeri A, Aarts E, Abbas SI, Bashir A, Behrens E, Billy H, Cohen RV, Caina D, De Luca M, Dillemans B, Fobi MAL, Neto MG, Gawdat K, ElFawal MH, Kasama K, Kassir R, Khan A, Kow L, Kular KDS, Lakdawala M, Layani L, Lee WJ, Luque-de-León E, Mahawar K, Almomani H, Miller K, González JCO, Prasad A, Rheinwalt K, Rutledge R, Safadi B, Salminen P, Shabbir A, Taskin HE, Verboonen JS, Vilallonga R, Wang C, Shikora SA, Prager G
Obes Surg. 2024 Jul;34(7):2399-2410 doi: 10.1007/s11695-024-07345-8.
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