Michelle Williams, Naomi Watts, Ellen DeGeneres and Phillip Seymour Hoffman share fond memories of late actor Heath Ledger in the April issue of Interview magazine, PEOPLE reports.

• Naomi Watts: "He was a huge, obsessive, chess freak – and very, very good at it."

• Michelle Williams: "He had uncontrollable energy. He buzzed ... His mind was turning, turning, turning – always turning."

• Ellen DeGeneres: "He didn't try to be something that he wasn't. And I appreciated that."

• Phillip Seymour Hoffman: "Whenever Heath talked about something he liked, he did it in the way that any fan would. He wasn't somebody trying to cover up his excitement about something, or someone."

• Todd Haynes: "That performance in Brokeback Mountain was such a sensitive, understated, controlled interpretation of this character. The entire emotional power of that film, which is enormous, resides in that performance, and how much Heath holds in."