Hai Zhang is a Professor in Anqing Normal University, China. Since July 1999, he has been working in the School of Mathematics and Computation Science, Anqing Normal University, Anqing, China. He received the Ph.D. degree from Anhui University, China, in 2010. From December 2012 to November 2014, he was a Postdoctoral Research Fellow at the Department of Mathematics, Southeast University, Nanjing, China. His current research interests include functional differential equations, fractional-order systems, neural networks, control theory and stability theory.