Career
Zweifel entered the United States Foreign Service in 1962, undertaking an assignment as a political officer in Brazil. Ambassador to North Yemen (1981-1984)
Deputy Chief of Mission, Amman, Jordan (1979-1981)
Deputy Chief of Mission, Muscat, Oman (1974-1976)
Political Officer, Mexico City, Mexico (1971-1974)
Consul, Amman, Jordan (1969-1970)
Personnel Officer (1965-1967)
Political Officer, Rio de Janeiro, Brazil (1962).
