The 8th principal of River Valley High School (RVHS), Koh Yong Chiah has been dismissed from public service following his conviction in January.
Koh had been sentenced to four weeks' jail after he was caught lying about an extramarital affair with a school vendor.
His affair with school service provider Ivy Loke Wai Lin began during a Chinese High School community service trip to Lijiang, China, in 2001. Both were married.
Subsequently, Koh awarded awarded six contracts worth $162,491 to Ms Loke's firm, Education Architects 21 from May to Novemeber 2005.
He did not declare his relationship with Ms Loke to the quotation approval panel.
Prior to the police investigations, Koh was dubbed as one of the "super principals" when he was appointed cluster superintendent in 1999. He was a Senior Education Officer graded Superscale 'G'.
After the Corrupt Practices Investigation Bureau started investigating Koh in 2012, the father of two was redeployed to the Ministry of Education to assist in curriculum development.