Question: Who is noted for their work on the history of Egypt's largest Christian church?
Context: The Coptic Orthodox Church of Alexandria is an Oriental Orthodox Christian church based in Egypt, Northeast Africa and the Middle East.  The head of the Church and the See of Alexandria is the Patriarch of Alexandria on the Holy See of Saint Mark, who also carries the title of Coptic Pope.  The See of Alexandria is titular, and today the Coptic Pope presides from Saint Mark's Coptic Orthodox Cathedral in the Abbassia District in Cairo.  With 18–22 million members worldwide, whereof about 20 million are in Egypt (see Demographics section below), it is the country's largest Christian church. The True Jesus Church is a Christian Church that originated in China during the Pentecostal movement in the early twentieth century.  The TJC is currently one of the largest Christian groups in China and Taiwan, as well as the largest Chinese Pentecostal church and the largest independent church in the world. Father Menassa Youhanna (1899–1930) was a Coptic priest, historian and theologian, most noted for his work on the history of the Coptic Orthodox Church. As of the early 21st century, Christianity has more than 2.4 billion adherents, out of about 7.2 billion people.  The faith represents one-third of the world's population and is the largest religion in the world, with the three largest groups of Christians being the Catholic Church, Protestantism, and the Eastern Orthodox Church.  The largest Christian denomination is the Catholic Church, with 1.09 billion adherents.  The second largest Christian branch is either Protestantism (if it is considered a single group), or the Eastern Orthodox Church (if Protestants are considered to be divided into multiple denominations). Jubilee Christian Church International is a Christian church located in Boston, Massachusetts and Stoughton, Massachusetts.  With a congregation of over 6,800, it is, according to the Boston Globe , the largest Protestant church in Eastern Massachusetts.  The church operates New England's largest Christian bookstore, and hosts an annual gospel concert which draws some of the biggest names in gospel music. The Central Sulawesi Christian Church (Indonesian: "Gereja Kristen Sulawesi Tengah" ) is the largest Christian church in Central Sulawesi, Indonesia.  It belongs to the reformed family of churches.  The church was established in the early 1893 through the mission work of the Dutch Reformed Church (— A.C. Kruyt and N. Adriani — ) and became an independent denomination in 1947 when Indonesia declared its independence from the Netherlands and ordered all Dutch nationals to go home.  November 1993, there was in Tentena a celebration feast for 100 years Christianity. The Apostolic Christian Church (ACC) is a worldwide Christian denomination in the Anabaptist tradition.  Its theology is Arminian.  The Apostolic Christian Church practices credobaptism, closed communion, greeting other believers with a Holy Kiss, a capella worship in some branches(in others, singing is with piano), and the veiling of women during services.  The Apostolic Christian Church only ordains men, who are authorized to administer baptism, the Lord's Supper, and the laying on of hands.  Not every Apostolic Christian Church practices the veiling of women; however, it is seen in most. The Evangelical Christian Church (Christian Disciples) as an evangelical Protestant Canadian church body in North America (2004) can be traced to the formal organization of the Christian Church (Disciples of Christ) in 1804, in Bourbon County, Kentucky under the leadership of Barton Warren Stone (1772–1844).  The Stone Movement later merged with the efforts of Thomas Campbell (1772–1854) and his son Alexander Campbell (1788–1866) to become the Restoration Movement that gave birth to the Churches of Christ (Non-Instrumental), the Christian churches and churches of Christ, the Churches of Christ (non-institutional), and the Disciples of Christ.  The Evangelical Christian Church (Christian Disciples) as a separate group within the Restoration tradition was reorganized in 2001.  The Evangelical Christian Church's national office in Canada is in Waterloo, Ontario. The Coptic Orthodox Church of Alexandria is the official name for the largest Christian church in Egypt.  The Church belongs to the Oriental Orthodox family of churches, since the Council of Chalcedon in AD 451.  This church was established by Saint Mark the apostle and evangelist in the 1st century.  The head of the church is the Pope of Alexandria. The Christian Church is a term generally used by Protestants and some others to refer to the whole group of people belonging to the Christian religious tradition throughout history.  In this understanding, the "Christian Church" does not refer to a particular Christian denomination but to the body of all believers; but most Christians follow the traditional Christian understanding of the term, and believe that the term "Christian Church" or "Church" applies only to a specific historic Christian body or institution, namely their own (e.g., the Roman Catholic Church, the Orthodox Church, the Non-Chalcedonian Churches of Oriental Orthodoxy, or the Assyrian Church of the East).  The Four Marks of the Church first expressed in the Nicene Creed are that the Church is One (a unified Body of Particular Churches in full Communion of doctrines and faith with each other), Holy (a sanctified and deified Body), Catholic (Universal and containing the fullness of Truth in itself), and Apostolic (its hierarchy, doctrines, and faith can be traced back to the Apostles).
Answer: Father Menassa Youhanna