Prolific (adjective)
pro·lif·ic
- producing young or fruit especially freely : FRUITFUL
- archaic : causing abundant growth, generation, or reproduction
- marked by abundant inventiveness or productivity
https://www.merriam-webster.com/dictionary/prolific
Mamet is a prolific writer of Hollywood screenplays, there are today more people who know his work than know that they know it.
In this sentence, the word prolific is used to describe Mamet as a writer; which describes his productivity and effectiveness as a writer.
