Dejen Gebremeskel grew up in the rural setting of Gulo-Makedaworeda in northern Ethiopia and took up running as a child, representing his school.[3] He began competing around the Tigray Region and after establishing himself in local races, he moved to Addis Ababa to train with the national team.[4]
At the 2009 Ethiopian cross country trials in February, he came in third place.[12] His main focus for the year was on track races and he had a successful transition into the senior ranks, winning at the Adidas Track Classic in May then improved his 5,000 m best to 13:03.13 min by taking third at the Reebok Grand Prix in New York City, where he was beaten only by Olympic medalists Micah Kogo and Bernard Lagat.[13] He ran a 3,000 metres best of 7:58.69 m at the Prefontaine Classic and came fourth at that year's London Grand Prix.[6]
Dejen competed indoors for the first time the following year and was second at the Boston Indoor Games behind Lagat.[14] He was also the runner-up at the Birmingham Indoor Grand Prix two weeks later and was selected to represent Ethiopia over 3,000 m at the 2010 IAAF World Indoor Championships. He ran the second fastest qualifying time (a personal best of 7:44.26 min),[15] but did not perform as well in the event final, coming tenth.[6] Outdoors, he was second at the Carlsbad 5000, the Prefontaine Classic, and the DN Galan (at which he ran a personal best of 12:53.56 min for the 5,000 m).[6][16]
World and Olympic medals
He continued to focus on the track in 2011 and at the New Balance Indoor Grand Prix he defeated Mo Farah in unusual circumstances – Dejen lost a shoe on the first lap of the race, but he persisted and won in a time of 7:35.37 minutes, one of the fastest 3,000 m runs that year.[17][18] He debuted over the 10K road distance later that month and was runner-up to Sammy Kitwara at the World's Best 10K with a time of 27:45.[19] He won the Carlsbad 5K race in April, holding off Eliud Kipchoge,[20] and took his first win on the Diamond League circuit with a victory at the Adidas Grand Prix in New York City.[21] A run of 12:55.89 at the Golden Gala made him Ethiopia's second fastest 5000 m runner that season and he was selected for the national team for the 2011 World Championships in Athletics.[22] He comfortably progressed through the qualifying round and the 5000 m final came down to a four-way battle among himself, Farah, Lagat and Imane Merga. He was the last of the quartet to cross the line, but Imane Merga was disqualified after the medal ceremony as he had run outside of the track lanes. Dejen was promoted to the bronze medal, repeating his placing from the junior ranks three years previously.[23][24]
Dejen improved his 3000 m best to 7:34.14 minutes at the XL Galan, but was a little slower at the 2012 IAAF World Indoor Championships, placing fifth in the event.[25] He won the Carlsbad 5000 for a second year running in March 2012.[26] Two 5000 m wins on the 2012 IAAF Diamond League circuit, including a personal best of 12:46.81 minutes, making him the fifth fastest ever over the distance at the time, and earning him selection for the 2012 Summer Olympics.[25] At the Olympics in London, he was the fastest qualifier in winning his heat. In the final he chased Mo Farah over the final lap, but did not managed to catch the Briton and took the silver medal behind him.[27] He ended the year with a fourth-place finish at the Weltklasse Zurich, finishing second in the Diamond League rankings after Isaiah Kiplangat Koech.
A third straight win at the Carlsbad race opened his outdoor season in 2013.[28]
At the 2013 World Championships in Athletics, Gebremeskel finished 16th in the 10,000 metres in a time of 27.51.88.
In 2013, Gebremeskel held the world leading time for 10,000 metres of 26:51.02, which he set at the Folksam Grand Prix in Sollentuna, Sweden.
Capping off his 2014 indoor season, Gebremeskel scored a bronze medal in the 3000 metres with a time of 7:55.39 at the 2014 IAAF World Indoor Championships in Moscow, Russia.
Gebremeskel went on to win his fourth straight Carlsbad 5000 race in 13:13, this time over American rival Bernard Lagat.