Ms. Tahani Al-Surrayai joined the Biotechnology Dept. at KISR in 1995 as a Research Assistant. During the past twenty two years, she developed excellent technical skills and has actively participated in several important research projects in the area of Environmental Biotechnology. Her role in the many projects resulted successfully in the isolation, characterization and optimization of a large number of new microbial strains from the local environment. These strains have been used as an integral part of the developed sulfur amendment for enhancing soil fertility. Additionally, Mrs. Al-Surrayai leads a task in a study that focused on the screening and evaluation of PAHs degrading microorganisms for the local environment. Besides her depth of knowledge and skills in biochemistry and microbiology, she involved in the development of probiotic bacteria for use in livestock and poultry. Accordingly, she has been leaded two successful projects in probiotics fields for livestock.