Please answer the following question: Facts:   - president: barack obama    - predecessor: marie l. yovanovitch    - country: armenia      - term end: december 2014    - term start: october 6 , 2011    - name: john a. heffern    - image: john a. heffern us state dept photo.jpg    - birth place: saint louis , missouri    - alma mater: michigan state university    - ambassador from: united states   Based on these bullet points, write a short biography describing the life of john a. heffern .
A:
john a. heffern was the united states ambassador to armenia from 2011 to 2014 .after being nominated in may 18 , 2011 by united states president barack obama , heffern was confirmed by the u.s. senate on september 26 , 2011 and sworn in as ambassador on october 6 , 2011 .he was replaced by ambassador richard m. mills in early 2015 .