He had his best season in 2007–08 when he led the SM-liiga in goals, points, and plus-minus, winning the Aarne Honkavaara, Veli-Pekka Ketola, and Matti Keinonen trophies, respectively, for his efforts.

[3] After one season in North America, Pesonen opted to return to Europe and signed with Russian club Ak Bars Kazan of the Kontinental Hockey League on 4 August 2009.

[4] He left Kazan after two seasons for a try-out contract with the Winnipeg Jets of the National Hockey League (NHL) on 11 August 2011.

[6] After a year in Finland playing for HIFK, Pesonen announced he had signed a one-year contract with Ak Bars Kazan.

On August 24, 2016, Pesonen signed a seven-week contract with HC Ambrì-Piotta of the National League A (NLA) as an injury replacement for Adam Hall.