American Ballet Theatre's fall season at Lincoln Center's Koch Theater offers a chance to see the company in shorter works and mixed-repertoire programs. This year's October 16–27 run honors principal Herman Cornejo, who's celebrating his 20th anniversary with the company. Cornejo will be featured in a special celebratory program as well as a new work by Twyla Tharp (her 17th for the company), set to Johannes Brahms' String Quartet No. 2 in G Major, Op. 111. The October 26 program will include Cornejo in a pas de deux with his sister, former ABT dancer Erica Cornejo.