|Born: February 4, 1994|
Kellogg was drafted by the Toronto Blue Jays in the 12th round of the 2012 MLB Draft out of Henry Street High School in Whitby, Ontario but did not sign. He attended Arizona State University and was then drafted by the Cubs in the 5th round of the 2015 MLB Draft.
Kellogg signed with Chicago and was assigned to the Eugene Emeralds, where he spent the whole season, posting an 0–1 record with a 4.98 ERA in 21.1 innings pitched. In 2016, he pitched for the South Bend Cubs where he pitched to a 9–7 record with a 3.03 ERA and a 1.08 WHIP in 24 games (23 starts). He spent 2017 with the Myrtle Beach Pelicans where he struggled, going 5–7 with a 5.12 ERA in 23 games (twenty starts). He returned to Myrtle Beach in 2018, where he moved to the bullpen, compiling a 3-1 record with a 3.58 ERA in 37 relief appearances.
Kellogg was selected as a member of the Canada national baseball team at the 2011 Pan American Games, 2012 18U Baseball World Championship, 2017 World Baseball Classic and 2019 Pan American Games Qualifier.
- "Ryan Kellogg Stats, Highlights, Bio – MiLB.com Stats – The Official Site of Minor League Baseball". MiLB.com. Retrieved February 22, 2018.
- "Ryan Kellogg Stats, Highlights, Bio - MiLB.com Stats - The Official Site of Minor League Baseball". MiLB.com. Retrieved October 12, 2018.
- "Team Canada's Adam Loewen replaced by Ryan Kellogg ahead of WBC". sportnet.ca. March 1, 2017.
- "Baseball Canada announces roster for Pan Am Games Qualifier". Baseball Canada. January 9, 2019. Retrieved March 8, 2019.