Career
He personal best for the distance is 2 hours and 8:30 minutes. His first top level appearances came in 2007: he ran at the Nedbank half marathon in Bloemfontein in April, coming seventh with a time of 1:03:51, and then in October he entered into his first marathon race, the Dublin Marathon, and managed to finish in third place with a time of 2:11:08. He competed in the United States for the first time the following year and his run of 2:14:20 was enough for second place behind Michael Aish at the Rock "n" Roll Arizona Marathon.
The Kosice Peace Marathon was the venue for his third outing over the distance that October, and he seized control of the race, outrunning even the official pacemaker (David Makori).
His performance at the Seoul International Marathon in 2009 gave Dejene a number of scalps over quicker, more established runners. Finishing as the runner-up with a time of 2:08:30, he had beaten pre-race favourites Jason Mbote and Paul Biwott by a margin of two minutes.
He was selected for the Ethiopian men"s marathon team at the 2009 World Championships in Athletics, earning his first major national selection at the age of 30. He finished in 15th place as the third fastest Ethiopian in 2:15:09, a time which (alongside Tsegay Kebede and Yemane Tsegay) helped Ethiopia to the team silver medal as part of the Marathon World Cup section of the race.
He began his 2010 season at the Dubai Marathon in January and finished in seventh place.
He ran over 20 km at the 20 van Alphen race in the Netherlands and managed second place behind Bernard Chepkok with a best of 58:22 for the distance.