Dr Dianliang Lei has been working at World Health Organization since 2003 as a scientist working in Health Product Policy and Standards department, responsible for development of WHO international standards including measurement standards and written standards for biological products. He has been in charge of development of WHO Guidelines for lot release of vaccines, GMP for biological products, Guidelines for post-approval changes to vaccines, Recommendations for acellular pertussis vaccines, DT-based combined vaccines, Hepatitis E vaccines, Enterovirus vaccines, yellow fever vaccines, Guideline for regulatory oversight of pandemic vaccines, Guideline on the replacement and removal of animal tests for the QC of biologiclas and Manual for establishment of national standards. Dr Lei, before joining WHO, was a deputy director of National Institute for the Control of Pharmaceutical and Biological Products responsible for regulation, quality control and biological standardization of vaccines in China. He contributed to the strengthen the regulation system for vaccines in China, especially on the national requirements (pharmacopeia) for biologicals, standards, specification for vaccines and lot release system. He obtained a PhD in medical science in Medical School of Osaka University Japan in 1996.