Yaman, a graduate of METU, worked at Unilever for 10 years. He managed the two big brands of Unilever: Sana and OMO. Founding YGA in 2000 and currently chairing the YGA Board, Yaman attended research and training programs in various countries of the world - UK, France, Germany, Sweden, Brazil, USA. He was in charge of 22 countries in his last position. Currently teaching at a university, Yaman gave speeches to over 100,000 students, lecturers and business people in the most prestigious universities of the world such as Harvard, Stanford, Duke, Georgia Tech and UCLA. Yaman provides consultancy for senior managers of multi-national and international companies and prepares leadership programs, including: Turkcell, Unilever, İş Bankası, Fritolay, Danone, Garanti Bankası, Nokia, Bosch, Roche, Novartis, Koç Holding, Alarko, Yapı Kredi, Eti, Coca Cola and HSBC. He published his first book "Truthful Leader" in 2002 (also translated into English), and his second book "Leader & Dream Partners" in 2006. Besides giving interviews to both Turkish and American press, Yaman also appeared as a guest on TV shows.