Daryo Dec 15, 2013:

These two are the best known ... "Investigative Authors": Bob Woodward and Carl Bernstein
Now, it's not impossible that in your ST "Investigative Author" is used in some less frequent meaning, so more context would be really useful.
Another good example of an "Investigative Author":

"A thoughtful account of the rise, fall, and subsequent rise again of thalidomide's fortunes."-Richard Horton, editor of The Lancet, in The New York Review of Books. In this riveting medical detective story, Trent Stephens and Rock Brynner recount the history of thalidomide, from the epidemic of birth defects in the 1960's to the present day, as scientists work to create and test an alternative drug that captures thalidomide's curative properties without its cruel side effects. A parable about compassion-and the absence of it-Dark Remedy is a gripping account of thalidomide's extraordinary impact on the lives of individuals and nations over half a century.
[http://www.amazon.co.uk/Dark-Remedy-Thalidomide-Revival-Medi...]

Daryo Dec 13, 2013:

The usual way someone gets to be called an "Investigative Author" has rather loose connection with what is an "autor istraživanja" (which would be simply "the author of the research", with different connotations attached). Can you give any indication what is this ST about? A scientific study published in a some science periodical? Is there only one author, or more? A full sentence?