At 17 or 18 he was signed by Connie Mack with the Philadelphia Athletics, who traded him away before he really learned the ropes. He went on to become a Hall of Fame pitcher, perhaps most well known for his five World Series wins when he was with the New York Yankees.

Read some newspaper articles about Herb Pennock by following the links at the bottom of the page or go to his wikipedia.org page by following the link below.
http://en.wikipedia.org/wiki/Herb_Pennock

https://www.findagrave.com/memorial/4467/herb-pennock

or view his National Baseball Hall of Fame plaque and many more photos at this link.
http://www.lonecadaver.com/Pennock.html
http://baseballhall.org/hof/pennock-herb

Read about other WMA students who were famous in this article in the Wenonah Historical Society newsletter
http://wenonahhistoricalsociety.org/sites/default/files/WHS%20Newsletter...

See his signature on a number of documents on this link.
http://www.psacard.com/Articles/ArticleView/6615/the-autograph-expert-au...

This article covers Pennock's life, including a story about the Navy diverting a ship so he could pitch for the Navy baseball team against Army on the 4th of July in front of King Edward. If you have to ask which team won you should read the article.
http://sabr.org/bioproj/person/612bb457