The MSC model attracted international interest and Williams co-authored a book on the concept entitled Breakout: One Church's Amazing Story of Growth Through Mission-Shaped Communities. In 2008, while speaking on the model at a conference of the Anglican Diocese of Pittsburgh, Williams was connected to Trinity Church, a non-denominational multisite church in Greenwich, Connecticut. Trinity had been founded ten years before Williams' arrival but was not growing, with an average attendance of 250 to 300. Williams grew the church to 1,200 in attendance at three Sunday services in addition to a Trinity offshoot in Darien. Trinity's services were held in rented space in schools, hotels, and other churches, a deliberate decision (although Williams led a $6 million fundraising campaign for Trinity's office and ministry center for midweek programming in Greenwich). Williams was also noted for his use of video and social media as pastor of Trinity.
