- 1999[position unknown]
- 1987[position unknown]
- 2006[position unknown]
- 1986[position unknown]
- 1979[position unknown]
- 1968Visiting Associate
- 1976Associate Investigator
- 1977Associate Investigator
- 1978Associate Investigator
- 1982[position unknown]
- 1988[position unknown]
- 1999[position unknown]
- 2000[position unknown]
- 2003[position unknown]
- 2004[position unknown]
- 2008[position unknown]
- 2009[position unknown]
- 2010[position unknown]
- 1985[position unknown]
- 1979[position unknown]
- 1987[position unknown]
- 2005[position unknown]
- 2006[position unknown]
- 1967Investigador Asociado
- 2011[position unknown]
- 2003[position unknown]
- 2004[position unknown]
- 1967[position unknown]
- 1981[position unknown]