Roger F Thoma.

 

Roger is from Columbo, Ohio, USA. He is the Senior Curator of Crustaceans at the Ohio State University. He definately has a passion for crayfish and it is obvious his Great Lakes are very dear to him. Roger also does environmental work for the EPA in Ohio. He has supplied the majority of photographs of northern america crayfish and also pictures of crayfish predators and surveying techniques.