He also served as department chair at both institutions .
He was a member of the faculty at Drake University from 1979 to 2004 , and since then has been a professor in the Department of Communication Studies at Northwestern University .
member also served as department chair at both institutions .
He was a member of the faculty at Drake University from 1979 to 2004 , and since then has been a professor in the Department of Communication Studies at Northwestern University .