Yes, Albert Einstein used pens, specifically fountain pens, throughout his life.
Einstein relied on pens for his writing and calculations, which were crucial for developing his groundbreaking theories. He is known to have used both a Pelikan 100 N and a Waterman Taper-cap Fountain Pen. These pens were instrumental in helping him develop the Theory of Relativity and document his scientific breakthroughs. The reference materials confirm that Einstein used fountain pens in his work.