Tuttle's projects for
Aman Resorts has been credited to define the hotel group's calm design style. His works for the chain garnered considerable media attention and had been featured on numerous books on architecture and design. His designs, as part of Aman Resorts' larger portfolio had been claimed to have significantly changed hospitality design, and influenced the works of other hospitality architects like
Bill Bensley. In 1986, Adrian Zecha hired Tuttle to design a resort on a coconut grove on Phuket's Pansea beach in Thailand. He studied
Thai traditional architecture and classical teak houses before designing the hotel; this pattern of local cultural sensitivity continued with his ensuing projects. The project's design claimed to capture the essence of Thai design and prioritised a design that was liveable; markedly an antithesis to other luxury hotels of the day. Tuttle attributed his approach to prioritise the location's cultural context and the structure's impact to the surrounding environment; it was reported that Tuttle elected to build around the coconut trees on the site's grove instead of cutting them down. The 30-room resort opened in 1988 as Amanpuri, receiving significant media coverage on the hotel's radical form and original style; it became frequently credited as a template for future luxury hotels worldwide despite not advertising. In 1991, he and Australian architect,
Kerry Hill collaborated in the design of the Sukhothai Hotel in Bangkok, Thailand. In 2003, Tuttle designed the interiors of the Park Hyatt hotel in
Milan, occupying a 130-year-old former office building. Tuttle's design for the hotel was featured in an article in
The New York Times. Tuttle continued designing hotels with Aman up until 2012, marked by the opening of the Amanzoe resort in
Ermionida, Greece. == Later career and life ==