If you've done machine learning and worked with large data sets then many places will be interested in hiring you. For example, the NSA often hires mathematicians with these skills. So does Google. Also Microsoft Research, IBM, Hewlett-Packard, etc. I wrote a longer answer on several of these places [here][1], and one with more details on government work [here][2].


  [1]: https://mathoverflow.net/questions/88219/changing-careers-becoming-a-professional-mathematician/88249#88249
  [2]: https://mathoverflow.net/questions/116309/the-non-traveling-mathematician-problem/116324#116324