| 
 | |  | :October 1995- May 1998 - | 
  Teaching Assistant, Department of Computational Mathematics, College of Mathematics, Moldova State University, Kishenev, Moldova. | 
 
  | 
 
   | 
  :September 1998 - May 1999 - Lab Supervisor Department of Computational Mathematics, College of Mathematics, Moldova State University, Kishenev,
  Moldova. | 
 
  |    | 
 :October 2000- Sep. 2004 - Assistant
  Prof. (as a full-time lecturer), Faculty of science, Mathematics Departments, Jerash University, Jerash, Jordan | 
 
 :September 2004 – March 2010 -
Assistant Prof. (as a full-time
lecturer), Faculty of science
                                            Mathematics Departments, King Faisal
University, AlAhs’a,
                                                        
Saudi Arabia.
      June
2005 – August 2005 -
Assistant
Prof. (as a part-time in the summer Semester.)
                                                       
Al Ta’ef University, Al Ta’ef, Saudi Arabia.
    
     June 2005 – August 2005 -
Assistant Prof. (as a part-time
in the summer Semester.)
                                                       
Jerash University, Jerash, Jordan.
 
     March
2010 – September 2012 -
Associate
Prof., Faculty of science, Mathematics
                                             Departments, King Faisal University,
AlAhs’a, Saudi Arabia
 
    September 2012 – April 2013 -
Full time lecturer of the rank
of Assistant Professor
                                                         Department
of Mathematics, Faculty of science
                     Al Hussein Bin Talal
University, Ma’an, Jordan.
   
   April 2013 – September 2013 -
Full time lecturer of the rank of Associate
Professor
                                                       
Department of Mathematics,Faculty of science, Al Hussein Bin Talal
University Ma’an, Jordan.
  
  September 2013 – September2014 -
Associate Professor, Department of
Mathematics, Faculty 
  of science, Al Hussein Bin Talal University, Ma’an, Jordan
 
September
2014 - till - date
Professor, Department
of Mathematics, Faculty
                                                     
of science, Al Hussein Bin Talal University, Ma’an, Jordan.