After graduating from Galatasaray High School, Kasapoğlu studied at the Theatre Department of the University of Paris Sorbonne where he completed his education in 1981. From 1978 to 1983 he worked at the Pierre Vial workshop of the Paris State Conservatory, where he assisted many directors in Paris. In 1982, he founded a theatre named Theatre a Venir in Paris and directed numerous works there, many of which have participated in festivals and held organized tours. Upon the invitation of İstanbul Municipality City Theatres, he returned to Turkey and directed the plays The Servant of Two Masters (1987) and King Lear (1990), both of which have granted him many awards. During his time as a director at the State Theatre, he has staged Shakespeare plays in many cities of Anatolia such as Adana, Antalya, Diyarbakir, Erzurum, Konya, Sivas, Trabzon and Van. He was one of the founders of Aksanat Production Theatre (1995) in İstanbul and the founder of İzmit Municipality City Theatre, which made its grand opening with the six-hour full version of Hamlet in 1997. Kasapoğlu founded his own independent theatre, Semaver Company, in İstanbul in 2002. Kasapoğlu has received the following awards for numerous works he has staged throughout his career: 1987-1988 season Ministry of Culture Best Director Award (1987-88), Avni Dilligil Best Director Award (1990-91), Theatre Critics Association, Theatre Director of the Year Award (1993-94), Ankara Art Institution, Best Director Award (1995-96), Theatre Critics Association, Honorary Award of the Year (1995-96) Yapı Kredi Afife Theatre Awards, Best Director Award and Tiyatronline Audience Awards, Best Director Award (2000), Sadri Alışık Anatolian Theatre Actor Awards, Director of Best Production of the Year (2013), Lions Theatre Awards, Most Successful Director of the Year (2015), Yapı Kredi Afife Theatre Awards, Muhsin Ertuğrul Special Award (2017) and Sakıp Sabancı Lifetime Achievement Award (2019).