This seems to be off the English speaking radar so I'll post it for those who know of Luang Por Thong.

"Luang Por Thong" Abbot of Wat Phra That Si Chom Thong in Chiang Mai provincei died today, December 13, 2019 at the age of 96 years old.  He was a highly respected vipassana master in Thailand and had an immense influence on the type of meditation practised in Northern Thailand. 

"Venerable Ajahn Tong Sirimangalo has devoted his life to the practice and teaching of Satipatthana Vipassanā Kammatthana (insight meditation based on the four foundations of mindfulness). Ordained as monk in 1934, has spent 6 decades teaching meditation and establishing and expanding meditation centres throughout Thailand; he is the abbot of the Buddhist Monastery Wat Chom Tong (Chiang Mai province) which includes an inteational meditation centre and 300 meditation rooms. He is Chief Vipassanā Kammatthana Master of the Northe Region of Thailand and is one of Thailand’s most respected meditation teachers."

Biography can be found here. https://www.sirimangalo.org/bio/

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That is very sad, thanks for sharing this. So who is the most senior and respected Abbot in Chiang Mai now?