[2] He advocated fresh air, physical exercise, rest and sunshine to treat his patients.

[3] He combined sunbathing with climatic treatment by cold air and high altitude.

[2] Rollier was influenced by the research of Niels Ryberg Finsen and established sunbathing clinics in the Swiss Alps.

R. A. Hobday noted that "Rollier practised sunlight therapy at Leysin for over forty years and had thirty-six clinics with a total of more than 1,000 beds.

[6] Rollier was elected an honorary member of the American Clinical and Climatological Association in 1923.