Lee Hsien Loong Is The Longest Serving First World Leader

As of Jan 2019, he has been in power for 14 years and 142 days, edging out Goh Chok Tong who held that office for just under 14 years. This makes PM Lee the current longest-serving leader of a first world country. In that time PM Lee has seen 3 Singapore Presidents, 4 US Presidents, 4 British Prime Ministers, 3 Malaysian Prime Ministers, and 2 Chinese Presidents.