Wikipedia
The Jerrahi () are a Sufi tariqah (order) derived from the Halveti order. Their founder is Hz. Pîr Muhammad Nureddin al-Jerrahi, who lived in Istanbul and is buried at the site of his tekke in Karagumruk, Istanbul. During the late Ottoman period, this order was widespread throughout the Balkans, particularly Macedonia and southern Greece ( Morea).
Founded in the 17th century by Hz. Pîr Muhammad Nuraddin al-Jarrahi, the Halveti-Jerrahi Order of Dervishes is a cultural, educational, and social relief organization with members from diverse professional, ethnic and national backgrounds.
Al-Jarrahi was a direct descendant of Hz. Muhammad (sav) both from his mother and father. The path he founded is dedicated to the teachings and traditions, through an unbroken chain of spiritual transmission ( silsilah), that go directly back to Muhammad (Risaletpenâh Hz.)
The head dergah "convention" of the Halveti-Jerrahi order is in Karagumruk, Istanbul. There are some substations in Turkey and has branches in some European countries, Australia, South Africa, South America and North America, including Los Angeles, New York, Mexico, San Francisco, Toronto and Chicago.
Branches of the Halveti-Jerrahi conduct gatherings where the dervishes perform Sufi remembrance ceremonies ( dhikr), practice sufi music, serve dinner, pray together and listen to the discourses (sohbets) of their Sufi guides.
This order was brought to western countries by the 19th Grand Sheikh Muzaffer Ozak (also known as "Muzaffer Efendi"), who died in 1985. From 1985 to 2000 the Grand Sheikh was Sefer Dal Efendi. Since 2000 the Grand Sheikh is Tugrul Efendi.