https://kr.linkedin.com/pub/timothy-atkinson/12/757/493
http://www.seoulselection.com/bookstore/default/product_view.php?part_idx=266&goods_data=aWR4PTk1MCZzdGFydFBhZ2U9NDIwJmxpc3RObz01MTcmdGFibGU9Y3NfZ29vZHMmcGFydF9pZHg9MjczJnNlYXJjaF9pdGVtPTE=%7C%7C
http://catalogue.nla.gov.au/Record/5148861
There are some videos of him on Youtube practicing the Korean martial art Kuk Sul Won:
There are only two hits on the internet for Mr. Hastings, from the year after I left Korea for Japan.
He had been running a company called K/H Business Communications & Consulting
https://books.google.co.jp/books?id=FgssBgAAQBAJ&pg=PA259&dq=%22Joel+Hastings%22,+Korea&hl=ja&sa=X&ei=qW_8VPipF-i_mAX_y4KICw&ved=0CCcQ6AEwAA#v=onepage&q=%22Joel%20Hastings%22%2C%20Korea&f=false
https://books.google.co.jp/books?id=2Gi3AAAAIAAJ&q=%22Joel+Hastings%22,+Korea&dq=%22Joel+Hastings%22,+Korea&hl=ja&sa=X&ei=qW_8VPipF-i_mAX_y4KICw&ved=0CDYQ6AEwAg
More later...