Item 5.02         Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On May 20, 2013, Dr. Robert Melamede resigned as CEO of Cannabis Science Inc. (the “Company”).  Dr. Melamede is continuing his services for the Company in the appointed positions of President, Interim CFO, and Director.

On May 20, 2013, Dr. Dorothy Bray entered into a two year management agreement with the Company and was appointed a director and CEO.  Under the agreement, Dr. Bray is compensated $5,000 per month and was issued 5,000,000 Rule 144 restricted common shares with a fair market value of $230,500 for services rendered.

Dr. Dorothy Bray is British national, a 1978 graduate of one of the oldest universities in the world, the Jagiellonian University in Cracow, Poland. She holds a Ph.D. degree from The University of London, United Kingdom. After her Fellowship at the Polish Academy of Sciences, in 1981 Dr Bray received a position at the ARC Institute of Animal Physiology, Babraham, Cambridge, in the United Kingdom working in neuropharmacology. In 1985 she received Churchill Fellowship to study medicinal plants in Africa and subsequently continued the research on medicinal plants at the School of Pharmacy and The London School of Hygiene and Tropical Medicine till 1989 when she received the Royal Society grant to study immunology at the Orsay University in Paris, France. She became a Research Fellow at the Royal Free Hospital School of Medicine in London, UK in 1990 and joined pharmaceutical industry in 1993 to work in key developed and emerging markets in infectious diseases and to develop collaborations with academia  governmental and non- government organizations worldwide. Since 1993 Dr. Bray served as a Principal Clinical Research Scientist at Antivirals Wellcome Foundation, Senior Medical Strategy Head, International Medical Affairs, Glaxo Wellcome Inc, USA and UK a Senior Clinical Program Head of HIV and Opportunistic Infections for GlaxoSmithKline and also as Global Director of HIV Research for GlaxoSmithKline. Since 2000 she has been participating as a scientific advisor in multiple projects to enhance health systems in emerging economies in Africa and Latin America.  In 2002, she founded IMMUNOCLIN which now has a diverse R&D portfolio and is working on personalized approach to medicine and nutrition to develop novel solutions to manage ageing society. In addition to her industrial activities, between 2004 and 2011, Dr Bray served as a Member of the Scientific Staff and the Head of Scientific Business Development of The Medical Research Council Clinical Trials Unit in the UK.  She currently holds the honorary Senior Lecturer position at the Royal Free School of Medicine, University of London in London and continues to serve as the European Commission's Scientific Expert.