By training he is an entomologist specializing in Lepidoptera (butterflies), but he is known better as an ecologist and a demographer, specifically for his incorrect predictions about population growth and limited resources.
He is an entomologist. This is by training. This entomologist is specializing in Lepidoptera (butterflies). He is known better as an ecologist about population growth and limited resources. This was specifically. He is known better as a demographer for his incorrect predictions about population growth and limited resources. This was specifically.