- 1938Associate Curator Of Department Of Microscopy
- 1949Curator Of Limnology
- 1950Curator Of Limnology
- 1951Curator Of Limnology
- 1957Curator Of Limnology
- 1958Curator Of Limnology
- 1980[position unknown]
- 1951[position unknown]
- 1952[position unknown]