April 2004 to date  Assistant Professor, Faculty of Science, University of Khartoum-Sudan.

June 2004 to June 2006  Post-doctoral fellowship (JSPS) in Nagoya University-Japan.

July 1994 to 2004.   Teaching Assistant, University of Khartoum, Khartoum – Sudan.

Feb. 1999 to 2000.   Lecturer (part-time), Faculty of Engineering, Sudan University for Science and Technology, Khartoum – Sudan.

Sep. 1998 to 2000.   Lecturer (Part-time), University of Juba, Khartoum-Sudan.

Jan. 1994 to 2000.   Research assistant (Part-time), The Remote Sensing Center, Khartoum.