I found the following through google. Says it was last updated on July 4th, so I guess the info should be current.
Good luck
AIR TRAFFIC SERVICES
Singapore Air Traffic Control Centre
Fax : 65456252
Post Name DID Email
Chief (SATCC) ROSLY Md Saad
65412685
[email protected]
Deputy Chief (SATCC) Winston Au
65412430
[email protected]
Project Officer(Search & Rescue) Raymond SEAH, PB, PBS
65412665
[email protected]
Project Officer (Systems) KWEK Chin Lin
65412664
[email protected]
Project Officer (SATCC) TAN Keng Liang, PBS
65412667
[email protected]
Chief Flight Service R SUNDRARAJ, PB
65412433
[email protected]
Corporate Service Officer(SATCC) Ms AZLINA Hj.Rafiee
65412663
[email protected]
Or browse their site
here.