The Boston Symphony Orchestra has made three major announcements to its organizations.

Andris Nelsons, who is currently in his tenth season as the Ray and Maria Stata Music Director will move to an evergreen, rolling contract, extending his tenure as Music Director and has been named Head of Conducting at Tanglewood.

In a statement, Nelsons said, “It seems like just yesterday that I began my role as Music Director of the BSO. And yet, over the past ten years, the BSO has not only been a beloved orchestra, but my home. I am so thankful to the wonderful musicians, audiences, and communities here in Boston and the Berkshires, and look forward to strengthening and building on these relationships in the seasons to come. Furthermore, it will be an immense honor and privilege to connect with students and colleagues in my new role as Head of Conducting at Tanglewood. These first ten years have been wonderful, and I am excited for all we at the BSO are going to accomplish together in the future.”

The BSO also announced Carlos Simon as its inaugural Deborah and Philip Edmundson Composer Chair, a three-season position in which the composer and educator will contribute several new works to the BSO’s repertoire and will work together with Nelsons to curate concert programs and lead educational and outreach programs.

Regarding Simon’s new position, the BSO Eunice and Julian Cohen President and Chief Executive Officer Chad Smith said, “I couldn’t be more excited to welcome Carlos Simon to the BSO as our Composer Chair, and I am so grateful to Debbie and Phil Edmundson for their very generous support that enabled us to create this new position. Carlos is not only an innovative composer, but an incredible curator and devoted educator who embodies a belief that the work we do should reflect not only the world and society we live in, but our aspirations for its future. In Carlos, we have one of America’s leading composers with the ability to impact nearly everything we do at the BSO. I can’t wait to see the vision that Carlos brings to our organization play out in the years ahead.”

Finally, the BSO announced the establishment of a new Boston Symphony Orchestra Humanities Institute where initiatives across the broad range of humanities disciplines will serve to contextualize and enhance the BSO’s highly regarded musical programming.