Every single SIA dispatcher is put through the full 6 week Jeppesen course as its a CAAS prerequisite. The guy your friends report to is Adrian Khee by the way... but before you rush to send resumes, you must be a Singapore Citizen or Permanent Residence (Marriage or an upgrade from S-pass work permit will eventually lead to a
PR).
Also SATS, a SIA subsidiary, is hiring dispatchers like crazy... and they sponsor foreigners too.
The Chief Dispatcher at Royal Jet is Sridhar V. by the way...