Every January, Martin Luther King Jr. Day is observed on the third Monday. King Jr., who would have turned 91 in 2020, was born on January 15. Here are 5 facts about the legendary activist. 1. His given name at birth was Michael King Jr. 2. He earned a doctorate in systematic theology from Boston University in 1955. 3. Throughout the civil rights movement, Dr. King went to jail thirty times. 4. He posthumously won a Grammy in 1971 for best spoken word recording. 5. Dr. King was a big fan of the sci-fi TV show 'Star Trek.'