Feb. 1999 - Oct. 2002: Demonstrator at Biological & Geological Science Department, Faculty of Education, Kafr El-Sheikh, Tanta University, Egypt

Oct. 2002 - Apr. 2009: Lecturer at Biological & Geological Science Department, Faculty of Education, Kafr El-Sheikh, Tanta University, Egypt

Nov. 2006 - Nov. 2008: Ph.D. Student at Biocenter Klein Flottbek and Botanical Garden, Hamburg University, Hamburg, Germany

Apr. 2009 – Apr. 2014: Assistant Professor of Plant Ecology at Botany Department, Faculty of Science, Kafr El-Sheikh, Kafrelsheikh University, Egypt

Apr. 2014 - Jan. 2020: Associate Professor of Plant Ecology at Botany Department, Faculty of Science, Kafr El-Sheikh, Kafrelsheikh University, Egypt

Sept. 2014 – Jun. 2023: Contracted Associate professor at Biology Department, Faculty of Science, King Khalid University, Abha, Saudi Arabia

Jan. 2020 - till now: Professor of Plant Ecology at Botany & Microbiology Department, Faculty of Science, Kafr El-Sheikh, Kafrelsheikh University, Egypt