Fr. Shenouda Maher Ishak (pronounced Iss---Haq) is a Coptic celibate priest, founder of the Coptic Monastery of St. Shenoute the Archmandrite in Upstate NY, and one of the very few Coptic people who can actually speak and understand the Coptic language and has done several research, in my understanding, on the Coptic language and Coptic theology using original Coptic sources.
In this case, he seemed to have published his own work on the Coptic rejection of Chalcedon, and he is known for writing a lot. He wrote a thesis in his Oxford days as a PhD student on "The phonetics and phonology of the Bohairic dialect of Coptic and the survival of Coptic words in the colloquial and Classical Arabic of Egypt and of Coptic grammatical constructions in colloquial Egyptian Arabic" (a mouthful I know), which is more than 2000 pages. ya...lol!