Dr. Halemah Ibrahim El-Saeedy was born in Abha, Saudi Arabia. She is a Saudi professor, married, with four children. She has bachelor in Science-Physics, in 1999, with graduation (excellent with honor's grad), Faculty of Education for Girls - Girls College agency - Jeddah Scientific department. She finished her master degree in solid state physics on 2006, with graduation excellent, Faculty of Education for Girls - Girls College agency. Jeddah Scientific departments Solid State Physics and PhD degree in science, physics on 2012, King Abd Alaziz University, Jeddah Faculty of Education for girls Scientific departments Solid State Physics. Dr. Halemah is working now as Assistant professor, department of Physics, Faculty of Science, King Khalid University, Abha, Saudi Arabia. This book includes circumvite of Assistant professor Halemah and all her scientific production. Her main research topic is solid state semiconductors and its rules in solar cells.

Book collector is Dr. Mardia El Sayed, an Egyptian professor at National Research Center, Applied Organic Chemistry Department. In 2013 she received her PhD from Institute of pharmacy, Martin Luther University Halle, Germany. She has BSc and MSc in Organic Chemistry from Egyptian Universities.