With a history in the Turkish political right, Sezgin had actively participated in the historical Democrat Party led by Adnan Menderes until the 1960 coup d'état. Entering Parliament as a Member of Parliament for Aydın in the 1961 general election, he served continuously as an MP until the 1980 coup d'état, after which he was re-elected in the 1991 general election. He lost his seat in the 1999 general election and retired from active politics in 2002. He was also active in sport, having served as the 15th Chairman of Gençlerbirliği S.K. between 1967 and 1968.