Carol, seems like Robert B. Parker is a very prolific author. The detective is called Spenser, apparently.
Latest books he has published:
Hundred-Dollar Baby (2006)
Now and Then (2007)
High Profile (2007)
Rough Weather (2008)
Stranger In Paradise (2008)
Chasing the Bear: A Young Spenser Novel (2009)
Night and Day (2009)
here's the full list and a bio:
Robert B. Parker - Wikipedia, the free encyclopedia