By DAVID GELLES, KATE KELLY and JESSICA SILVER-GREENBERG

Elon Musk’s No Good, Very Bad Year

“This past year has been the most difficult and painful year of my career,” said Mr. Musk, the head of Tesla. “It was excruciating.”

“This past year has been the most difficult and painful year of my career,” said Mr. Musk, the head of Tesla. “It was excruciating.”