Onyx Hospitality Group has made five key hotel leadership appointments across Thailand as part of its ongoing growth and expansion. Christoph Leonhard has rejoined ONYX Hospitality Group as the new GM of Oriental Residence Bangkok. Sukamal Mondal has been promoted to CGM for the Shama Serviced Apartments portfolio of four properties in Bangkok, and will continue to lead as GM of Shama Lakeview Asoke Bangkok. Thomas Hain is GM at Amari Vogue Krabi, Paul Halford is CGM for Amari Koh Samui and OZO Chaweng Samui, while Richard Margo is GM of OZO Phuket.