Zakaria Mohamed earned his B.Sc. and M.Sc. in Assiut University, Egypt, and received his Ph.D. from Wright State University, Ohio, USA. He worked as assistant and associate professor in Assiut University in the Botany Department during 1998-2003, and from 2003-2008. He held a position as a visiting professor for teaching and research at King Khalid University, Saudi Arabia, from 2003-2011. Currently, he is a professor of Phycology/phycotoxins in the Botany Department, Faculty of Science, Sohag University, Egypt. He serves as a reviewer for various Elsevier, Springer, and Wiley & sons Journals. He was an invited speaker at 1st International Conference on toxins in desert environments, Weill Cornell Medical College in Qatar (2013). His research interests focus on: (a) Toxin production in cyanobacteria and microalgae (b) Effect of these algal toxins on aquatic and terrestrial environments.