Who are the Thich Nhat Hanhs of today?
For example, he was a Zen master whose writings reached a broad audience and provided a modern voice for a tradition where some of the foundational works such as the Platform Sutra are roughly a thousand years old. For other modern Zen voices, there are books such as Three Pillars of Zen, Dropping Ashes on the Buddha, Opening the Hand of Thought, and probably many others. (Albert Low is on my to-read list.) All of those are by authors who died before Thich Nhat Than, though.
He also was an activist and an original proponent of "engaged Buddhism," in which compassion is seen to mandate action for social change. I'm sadly ignorant of the current landscape here; the Dalai Lama and Gary Snyder certainly count, but they are both getting on in years.
He also wrote a lot of books that are light on doctrine but very direct, grounded, and gentle, that people have found comforting and supportive in a crisis. For that, many people look to the books of Pema Chödrön, Tara Brach, and Sharon Salzberg, who are at least a little bit younger, but all in their sixties or older.