Dr. Siddiqui is working as a Professor in the Department of Zoology, College of Science, King Saud University, Riyadh since 2009. He received his Ph.D.(Biochemistry) in 2008 from In Vitro Toxicology Lab, Indian Institute of Toxicology Research, Lucknow, India. He has also worked as Postdoctoral Fellow at University of Louisville, Kentucky, USA during 2007-2009.