Hi arjenvanlin,

The imdb_id field is returned as part of every person response:

{
  "adult": false,
  "also_known_as": [
    "William Bradley Pitt"
  ],
  "biography": "William Bradley \"Brad\" Pitt (born December 18, 1963 height 5' 11\" (1,80 m))...",
  "birthday": "1963-12-18",
  "deathday": "",
  "homepage": "",
  "id": 287,
  "imdb_id": "nm0000093",
  "name": "Brad Pitt",
  "place_of_birth": "Shawnee - Oklahoma - USA",
  "popularity": 13.8261006600649,
  "profile_path": "/kc3M04QQAuZ9woUvH3Ju5T7ZqG5.jpg"
}

If you're interested in other ids, you can also append the external_ids response to do this in a single call:

http://api.themoviedb.org/3/person/287?api_key=###&append_to_response=external_ids

{
  "adult": false,
  "also_known_as": [
    "William Bradley Pitt"
  ],
  "biography": "William Bradley \"Brad\" Pitt (born December 18, 1963 height 5' 11\" (1,80 m))...",
  "birthday": "1963-12-18",
  "deathday": "",
  "homepage": "",
  "id": 287,
  "imdb_id": "nm0000093",
  "name": "Brad Pitt",
  "place_of_birth": "Shawnee - Oklahoma - USA",
  "popularity": "13.8261006600649",
  "profile_path": "/kc3M04QQAuZ9woUvH3Ju5T7ZqG5.jpg",
  "external_ids": {
    "imdb_id": "nm0000093",
    "freebase_mid": "/m/0c6qh",
    "freebase_id": "/en/brad_pitt",
    "tvrage_id": 59436
  }
}

Cheers.

Thanks Travis, this is of great help!

Cheers, Arjen