Dr. Youhanna Nessiem Youssef served in St. George in Heliopolis, before his travel to France to finish his MA and PhD.
A lot of his works can be found under the “Coptic Treasure” website. his resume http://www.cecs.acu.edu.au/pdf/youhanna_CV.pdf
some of his articles can be found here https://acu-au.academia.edu/YouhannaYoussef