Vertical Banded Gastroplasty-Gastric Bypass: preliminary report. American Society of Bariatric Surgery, Dallas, Texas. June, 1991

Sixth International Symposium On Obesity Surgery, Genoa, Italy. September 20-23, 1992

Advances en la Cirugia de la Obesidad Sociedad Mexicana de Cirugia de la Obesidad Acapulco, Mexico. November 10-11, 1992

Ethnicity, Type of Obesity Surgery and Weight Loss. American Society of Bariatric Surgery. Iowa City, IA. June, 1993

Vertical banded gastroplasty-gastric bypass The Weight Reduction Operation of Choice, Vertical Banded Gastroplasty or Gastric Bypass? Society for Surgery of the Alimentary Tract. San Diego CA. May, 1995

Factors Limiting the Routine Management of the Morbidly Obese Patient. American Society of Bariatric Surgery, Seattle, WA. June, 1995

Staple Disruption in Obesity Surgery. American Society for Bariatric Surgery, Seattle, WA. June 1995

Cirurgia da Obesidade Morbida. Hospital das Clinicas. Faculdade de Medicine da Universidade de San Paulo, Brazil. November 22, 1996

Surgical Treatment of the Morbidly Obese. VII Congresso National Do Colegio Brasileiro de Cirugia Digestiva. Goiania-Goias, Brazil. November 27-30. 1996

Converting vertical banded gastroplasty to lesser curvature gastric bypass. The XI International Symposium on Obesity Surgery and The II Congress of the International Federation for the Surgery of Obesity (IFSO). Cancun, Mexico. October 1-4, 1997

Understanding and Treating Obesity. Englewood Hospital and Medical Center. Englewood, New Jersey. December 3, 1997

Gastro-gastric fistulas and marginal ulcers in gastric bypass procedures for weight reduction. Presented at the 1 5th Annual Meeting of the American Society for Bariatric Surgery, Orlando, Florida. June 25, 1998

Distinguished Guest Speaker. Sociedad Espanola de Cirugia de la Obesidad. Granada, Spain, December 4, 1998.

Bariatric surgery along the lesser curvature of the stomach: Lessons learned from our experience of 17 years and 2079 patients. Presented at the 1 7th Annual Meeting of the American Society for Bariatric Surgery, Memphis, Tennessee, USA, June 14-17, 2000

Conferencia: Estado Atual do Bypass Gástrico conventional. Round Table Moderator and Participant, III Congresso Brasileiro De Cirurgia Da Obesidade. Teatro da Faculdade de Medicina da Universidade de São Paulo, San Paulo, Brazil, November 17-19, 2000

Bariatric Surgery for the super-obese: What is the best operation? 18th Annual Meeting-American Society for Bariatric Surgery, Washington, DC. June 5-9, 2001

Bariatric surgery in adolescents. Presented at the 18th Annual Meeting of the American Society for Bariatric Surgery, Las Vegas, Nevada. June, 2002

Invited International Guest Speaker. La Sociedad Mexicana de Cirugia de la Obesidad, July 9, 2002

Distinguished Guest Speaker. "Gastroplasty plus Gastric Bypass in Morbid obesity" XX VII Spanish Surgical Association Congress, Meliá Castilla Hotel, Madrid, Spain. December, 2002

Narrow pouches along the lesser curvature. Presented at the 20th Annual Meeting of the American Society for Bariatric Surgery, Boston, MA. June 17-22, 2003

Conference: What is the ideal pouch? 8th World Congress of the International Federation for Surgery of Obesity (IFSO), Salamanca, Spain. September 3-6.

Distinguished Guest Speaker. "Gastroplasty plus Gastric Bypass in Morbid obesity" XX VII Spanish Surgical Association Congress, Meliá Castilla Hotel, Madrid, Spain. December, 2002.

Narrow pouches along the lesser curvature. Presented at the 20th Annual Meeting of the American Society for Bariatric Surgery, Boston, MA. June 17-22, 2003

Conference: What is the ideal pouch? 8th World Congress of the International Federation for Surgery of Obesity (IFSO), Salamanca, Spain. September 3-6

Invited International Guest Speaker. V Congresso Brasileiro de Cirugia da Obesidade. Fortaleza, Brazil. November 25-29, 2003