Trained--done medical training in South Africa,

担任客座嘉宾他在南非受过医疗培训
trained in public health at Johns Hopkins University,

也曾在约翰霍普金斯大学学习公共卫生
Derek Yach is one of the champions for global health.

他也是全球卫生公共事业的领军人物
He's done a great deal of research,

他本人做过许多科研
written a great number of papers and books

就全球卫生与疾病扩散问题
on the issue of global health and the spread of global disease.

也著有大量论文和书籍
He has special expertise in the worldwide spread of chronic disease,

他也是全球范围内与传染病不同的
as opposed to infectious disease.

慢性疾病方面的权威
When he was in South Africa,

在南非受训的同时
he established the Center for Epidemiologic Research

他也在南非医学研究理事会中
at the South African Medical Research Council.

创办了流行病学研究中心
He then came to the United States,

在那之后他到了美国