Serenity Knolls has provided alcohol and drug recovery based on the 12-step program to more than 5,000 individuals since its founder, Mike Neustadt, opened the doors of the Forest Knolls facility in 1990. Last April, Mr. Neustadt sold the treatment center to Arcadia Healthcare, which operates a network of over 500 behavioral health care facilities across the world. The corporation hired a new C.E.O. over the winter: Danielle Roeske, a graduate of the California Institute of Integral Studies and a Pennsylvania native with a holistic approach and some new ideas. “The more we can help residents view themselves, and subsequently their recovery journey, in a holistic way, the more empowered they will be to move forward on a path to success,” she said. “With this in mind, modalities such as yoga, experiential therapy, trauma therapy and eco-therapy are actively being explored as additions to the quality programming already in place.” Serenity Knolls can house 30 patients at a time; the typical 30-day program costs $18,000. The 12-acre property includes a swimming pool, volleyball and basketball courts and a dining room that features meals sourced from local producers. Residents take part in daily meditation, group therapy meetings and writing. Jeffrey Huff, a substance abuse counselor at the center, also attributes part of the program’s success to its family component: resident’s families are invited each weekend to visit, building relationships he said are vital for lifelong sobriety. Before he worked at Serenity Knolls, Mr. Huff was a patient. “This is the place that got me sober almost 15 years ago,” he said. “It means the world to me.” Mr. Huff has been working for the recovery center since 2003, and he’s just one of many staffers who have gone through the program and returned to work there. “We believe in the program,” he said. “It totally worked for us.” Of the 35 employees, nearly half are West Marin residents—and many, like Mr. Huff, have been there for years. The value of that stability is not lost on Ms. Roeske. She is continuing the center’s work helping residents understand the connection between seemingly separate issues, such as P.T.S.D., depression, anxiety, eating disorders and addiction. She’ll also further the center’s approach to providing long-term support to patients. “There’s a strong tendency to underestimate the fragility of sobriety,” she said.