Michail Todorov,graduated in 1984 and received a PhD degree in 1989 from the St. Klimem Ohridski University of Sofia, Bulgaria. Since 1990, he has been Associate Professor and Full Professor (2012) with the Department of Applied Mathematics and Computer Science by the Technical University of Sofia, Bulgaria. He has worked as a Senior Research Fellow in the Joint Institute for Nuclear Research at Dubna, Russia (2004) and as a Visiting Professor, a Visiting Scholar and a Visiting Consultant in the University of Texas at Arlington, TX, USA (2008,2009 and 2011) and Texas A&M University at Commerce, TX USA (2011), Sabbatical Professor at Southeastern Louisiana University at Hammond,LA, USA (2013) and Embrie-Riddle Auonautical University, Daytona Beach,FL,USA (2017).