Kaan Bergsen found specialty coffee in Brooklyn, worked briefly at Stumptown and learned to roast at Toby's Estate, where he ran quality control. Back in Istanbul he set Petra up as a roastery first, inside the Muse gallery in Gayrettepe, with a 12kg Probat and the city's first La Marzocco Strada. He won the SCAE Roasting Challenge in Turkey and placed fourth at the 2014 World Coffee Roasting Championship in Rimini.
Bergsen travels to choose lots himself, and the house rule is never to buy on a producer's name alone. The October 2026 release was Petra's first natural Kenyan, from Ruera Estate. Cafés followed in Şişhane, Topağacı, Maslak and Bebek, alongside the Gayrettepe original.
