Mark Costello, a classmate, says Wallace was pegged by professors there as someone who could become an important philosopher.

Mark Costello is the Iowa State Representative from the 23rd District.

One of his first books to come out was "Signifying Rappers," (he co-wrote it with Mark Costello).

NY Times book review by Mark Costello, accessed 17 October 2006.

Fields was defeated for reelection to a second term by Republican Mark Costello in the 2010 election.

Our reviewer, Mark Costello, said this book "brims with vivid portraiture."

Mark Costello is the Commissioner of Labor of Oklahoma.

Mark Costello may refer to:

The current Labor Commissioner is Mark Costello, a Republican who was elected to his first term in 2010.

The present Commissioner of Labor is Mark Costello who was elected by the people in November 2010 and took office January 2011.