From their website:
Our Primate, His Eminence Metropolitan Mar +Anthony was consecrated on April 18, 2011 to the Episcopacy of the Byzantine Catholic Church by Archbishop Peter Tang and Co consecrated by Archbishop Jean Ndjewel of the Old Catholic Church. His Consecration was accepted into Orthodoxy through cheirothesia in February 2013 by Metropolitan Stephen Thomas and Archbishop Timothy Kjera of the Syriac Greek Antiochian Orthodox Catholic Church, Sharon Pennsylvanian, USA. He was issued a bull of Cheirothesia tou presbyteriou, thus his entrance into the Oriental Orthodoxy through the Syrian Orthodox Church of Antioch.
This pretty much tells you everything you need to know.