Stephen Charles Donnellan (born 1954) is the Chief Research Scientist of the Evolutionary Biology Unit at the South Australian Museum.
This work led to the establishment of a comprehensive collection of reptile and frog tissues from Australia and New Guinea.
In 1990 Donnellan joined the South Australian Museum's staff and established the DNA laboratory there.
"[4] Donnellan ultimately determined that a genetically distinct population of the species exists, confined to the waters of Northern Spencer Gulf.
[5] In 2011, Donnellan expressed concern over the diminishing population forming the breeding aggregation at Point Lowly, and said that he believed constructing a new desalination plant nearby could have further adverse impacts.