JerAx made his name in Heroes of Newerth, where he played for a number of teams including "Dirty Minds" (with Era and SingSing) and "Man the fuck Up"/"KD-Gaming" (with Era). He then did a compulsory military service in the Finnish navy, and when he had finished it, started playing Dota 2.
On the 15th January 2018, JerAx unveiled his own merchandise website JerAx.GG. 
JerAx began his Dota 2 career in the Finnish team Rat in the dark as a support player. After playing with them for a month he was approached by SingSing, and JerAx joined his team, QPAD Red Pandas as a trialist. A while later he was announced as a full member of the team.
After more than a year of absence from the Dota 2 professional scene, JerAx became a part of the newly-formed Finnish squad 4 Anchors + Sea Captain alongside Trixi, MATUMBAMAN, Vaalix and Buugi. JerAx played the #4 position for the team, in addition to serving as the overall team captain and drafter. He left the team in early January 2015.
A few days later, JerAx joined the international team Team Tinker. After a couple months of disappointing results, JerAx parted ways with the team on March 6th, and was announced to be joining Korean team MVP HOT6ix. The team quickly became a powerhouse in the South East Asia scene, and after winning MPGL Season 7, the team qualified for The International 2015. Despite their strong play leading up to the tournament, MVP HOT6ix disapointed at the main event. They finished last in their group, and were knocked out in the first round of the playoffs by Invictus Gaming.
In the post TI5 shuffle, JerAx left MVP HOT6ix, and was revealed to have joined 5Jungz after the team was invited to the ESL One New York 2015 European Qualifiers. After a string of good results, he was picked up by Team Liquid. With winning The Defense Season 5 and reaching third place at WCA 2015, JerAx ended the 2015 calendar year on a high note.
JerAx continued his good form over the new year with double runner-up places in the Frankfurt and Manila majors respectively. With a consistent run of being second, JerAx won his first premier offline tournament in 2016 at EPICENTER. He left Team Liquid during the post TI6 shuffle.
- Can touch his nose with his tongue.
- Known for his Earth Spirit, JerAx has over 500 matches played on the hero and sports an impressive 75.5% win rate as listed on Dotabuff.
- JerAx was the first player to make 4 consecutive Major finals, with Team Liquid at The Shanghai Major and The Manila Major and with OG at The Boston Major and The Kiev Major.
|2018-08-25||1st||Premier||The International 2018||3 : 2||$11,234,200|
|2017-12-10||1st||Major||MDL Macau||2 : 0||$130,000|
|2017-08-10||7 - 8th||Premier||The International 2017||0 : 2||$617,198|
|2017-04-30||1st||Premier||The Kiev Major 2017||3 : 2||$1,000,000|
|2017-04-04||2nd||Premier||Dota 2 Asia Championships 2017||0 : 3||$91,799|
|2016-12-10||1st||Premier||The Boston Major 2016||3 : 1||$1,000,000|
|2016-08-11||7 - 8th||Premier||The International 2016||0 : 2||$519,262|
|2016-06-12||2nd||Premier||The Manila Major 2016||1 : 3||$405,000|
|2016-05-15||1st||Premier||EPICENTER 2016||3 : 2||$250,000|
|2016-03-06||2nd||Premier||The Shanghai Major 2016||1 : 3||$405,000|
|Complete list of results in any tournament|
- 2016-08-07 | Liquid Dota 2 | Player Profile - JerAx by Damian Estrada / 1UP Studios of Team Liquid
- 2019-06-23 | JerAx on possibility of teaming up with Topson and MATUMBAMAN by ProDota at EPICENTER MAJOR
- 2018-08-24 | OG.Jerax interview after game-winning Earthshaker play beats PSG.LGD in Winner’s Bracket Final by Adam Herbets of FOX5 News at The International 2018
- 2018-08-02 | JerAx discusses OG’s new roster heading into TI8 by Ollie Ring of redbull.com
- 2017-06-08 | Interview with OG.JerAx by 2009 of liquiddota.com at ESL One Birmingham 2018
- 2017-03-29 | Perjantai-documentary: I am JerAx by Yle Areena (trans. by Yle Areena)
- 2016-08-11 | TI6 Team Liquid Interview by Kaci Aitchison of Valve at The International 2016
- 2016-06-11 | The Manila Major - Interview: Jerax (Team Liquid) by Jake "SirActionSlacks" Kanner of PGL at The Manila Major
- 2016-05-24 | The Epicenter Epilogue: An Interview with the Players by lichter of TeamLiquidPro.com at EPICENTER 2016
- 2015-07-27 | TI5 Community Report: Hot_Bid and JerAx by Hot_Bid of Valve at The International 2015
- 2015-06-03 | The Target with JerAx: "Finnish people like to work together" by Sebastian “Heflamoke” Läger of The Target
- 2015-06-03 | Interview with JerAx: "We celebrated a bit more calmly than normal" by Nicole "Catosaurus" Lim of GosuGamers.net
- 2015-01-25 | Interview with JerAx: "You can do pretty much anything as a support." by Sun_Tzu of 2p.com
- Eric "reinnnn" Khor (2013-03-04). "QPad Red Pandas finalizes roster. Adds JerAx and SeleCT". GosuGamers. Retrieved 2013-04-17.
- JerAx (2018-01-15). "Jerax.GG announcement". Retrieved 2018-02-01.
- 4Anchors not disbanding
- lichter (2016-08-31). "JerAx Leaves Liquid". LiquidDota. Retrieved 2016-08-31.