He is replacing Apostolos Poulovassilis, who is set to join tanker owner Eletson.
Stamatellos, 48, joined LR in 2006 after spending 13 years as a principal engineer at ABS.
After the promotion, he will also keep his current position as Greek country manager.
Poulovassilis has spent his entire career with LR, serving various roles over the last 24 years. He became area manager for the east Mediterranean in 2003 and regional manager EMEA in 2009.
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