Patrick Stewart, the legendary actor known to many as Captain Jean-Luc Picard from the Star Trek universe and Professor Charles Xavier from the X-Men movie franchise, died on Wednesday at age 86. An Instagram post announcing the news says Stewart passed after a brief battle with Alzheimer’s Disease and Lewy Body Dementia.

When looking back at the slate of work Stewart put out into the world, you’ll find over six decades worth of performances. The actor cut his teeth in the world of Shakespearean stage productions and smaller TV projects, mostly in the UK, before he broke out into mainstream popularity in 1987, leading the crew of the Enterprise in Star Trek: The Next Generation.

Read more: Patrick Stewart, Who Gracefully Steered Star Trek Into Its Next Generation, Dies at 86

Along with Picard, he’s most known for the role of Professor Charles Xavier, the wheelchair-using leader of the X-Men .…