Sometimes Wikipedia will tell you a jew is a jew. Often, the information is either in the family background bio or in the rectangle at the bottom of Wikipedia's page (e.g. "Jewish American scientists" etc)  In the cases of both jew Normon Solomon, and jew Walter Isaacson, this info is currently not shown by Wikipedia. 
http://en.wikipedia.org/wiki/Walter_IsaacsonOnline bios of Walter Isaacson consistently do not state his racial jewishness.  Obviously, this is by specific design of the man himself and the biographical info he has released over the years.  Here, you can see his mother's jewish surname, and his father's jewish last and first names:

http://64.233.183.104/search?q=cache:qspTDIqtZH4J:www.nndb.com/people/673/000030583/+walter+isaacson%2Bbiography&hl=en&ct=clnk&cd=6Example-- "Seff" is Walter Isaacson's mother's maiden name, as stated in the link above:Seff+jewish= http://www.google.com/search?hl=en&q=seff%2Bjewish

Seff+synagogue =http://www.google.com/search?hl=en&q=seff%2Bsynagogue
 One can usually goole "someone's name+jewish" or "+jew" and find out.  Also try a name "+rabbi" or "+synagogue",  Examples:

http://www.google.com/search?hl=en&q=walter+isaacson%2Bjewish