What did R.H. Whittaker contribute to science?

Answer 1

Robert Whittaker's version of the five-kingdom system of classification of organisms was a standard feature of Biology textbooks during the last two decades of the twentieth century. Even as its popularity began to wane at the end of the century, remnants of Whittaker's ideas continued to be found in most textbook accounts of biodiversity.

Answer 2

His most significant contributions to ecology are in the development of the methods of gradient analysis.