A Life,' spoke on a Jan. 3 episode of NPR’s 'Book of the Day' podcast about Martin Luther King Jr., and noted that MLK didn’t have plans to become a civil rights leader when he joined the Montgomery Bus boycott in 1965.

The dual celebrations of a second Trump inauguration and the civil rights leader’s birth raise profound questions about Black leadership and progress toward the Rev. Dr. Martin Luther King Jr.’s dream.

Every year we honor the legacy of Martin Luther King Jr. in January. Here's everything you need to know about the holiday.