Original sentence: He has been Head of the Information Theory Group there since 1968, and presently he is Head of the Stochastics.He has held Visiting Professorships at various universities including Bielefeld University, Germany (1981), University of Maryland (several times, last in 1992), Stanford University (1982), University of Virginia (1985-86), etc
Edited sentence: He has been Head of the Information Theory Group there since 1968, and presently he is Head of the Stochastics Department.He has held Visiting Professorships at various universities including Bielefeld University, Germany (1981), University of Maryland, College Park (several times, last in 1992), Stanford University (1982), University of Virginia (1985-86), etc