He has previously played in the NFL for the Los Angeles Rams, with whom he won Super Bowl LVI.

[1] He played for the Stroudsburg High School Mountaineers under head coach Joe Bernard, and was ranked the 30th-best prospect out Pennsylvania by Rivals.com.

[2] Prior to choosing to commit to Rutgers to play college football, he received offers from Connecticut, Maryland, and Temple.

[3] Joseph-Day attended and played college football for Rutgers University from 2013 to 2017 under head coaches Kyle Flood and Chris Ash.

[8] In the 2016 season, he appeared in 11 games and recorded 29 total tackles, 3.5 tackles-for-loss, one sack, one pass defensed, and one forced fumble.

[9] In his final collegiate season, in 2017, he appeared in 11 games and recorded 35 total tackles, 4.5 tackles-for-loss, 1.5 sacks, one pass defensed, and one forced fumble.

[22] In Week 7, against the Seattle Seahawks, he recorded a safety when he and teammate Troy Reeder tackled Kenneth Walker in the end zone.

[34] Joseph-Day hosts a restaurant tour series on his YouTube channel called "Dine n' Bash".

[37] On March 27, 2023, Joseph-Day accused Transportation Security Administration (TSA) agents of sexually assaulting him at John Wayne Airport in Santa Ana, California.