As he explores his new roles within the Republican party and the business world after last year’s presidential campaign, Mitt Romney plans this summer to bring together “experts and enthusiasts” in both spheres for a gathering in Park City that is expected to include potential 2016 contenders Chris Christie and Paul D. Ryan.

In an email to guests obtained by the Times, Romney said he hoped to unite “political, business and other thought leaders” at the conference. The 2012 Republican nominee said in the email that Solamere, the investment firm cofounded by his son Tagg and his campaign finance chairman Spencer Zwick, would be among the sponsors of the gathering. Romney is the chairman of the Boston-based firm’s executive committee.

Romney, who once headed the private equity firm Bain Capital, organized similar events for his campaign donors in recent years, including a retreat last June that brought together more than 700 donors at Deer Valley’s Chateaux at Silver Lake. The weekend included a nod to Romney’s experience leading the Olympic Games in Utah — kicking off with a cookout at Olympic Park.