|Men's canoe sprint|
|Gold||2003 Gainesville||C-2 1000 m|
|Gold||2003 Gainesville||C-4 500 m|
|Gold||2005 Zagreb||C-4 500 m|
|Silver||2002 Seville||C-2 500 m|
|Silver||2003 Gainesville||C-2 500 m|
|Bronze||2003 Gainesville||C-4 200 m|
|Bronze||2006 Szeged||C-4 500 m|
|Bronze||2009 Dartmouth||C-4 1000 m|
He won his first major title at the European championships in 2002, winning the C2 1000m final with Florin Popescu. In 2003 they became world champions at Gainesville, USA. Simioncencu was also a member of Romania's C-4 500 m crew which crossed the line second but was later awarded the gold medal after Russian Sergey Ulegin failed a doping test. A fourth-place finish in the C-4 200 m was also upgraded to bronze for the same reason.
In 2004 Simioncencu also won a C-4 500 m gold medal at the European championships, this time without the aid of disqualifications. At the Athens Olympics Simioncencu and Popescu were unlucky to miss a medal, finishing fourth in both C-2 finals (500 m and 1000 m).
In 2006, Simioncencu won his third consecutive European C-4 500 m title at Račice, Czech Republic. At the World Championships in Szeged, Hungary, however the Romanians had to settle for the bronze medal behind Belarus and Poland. He won another bronze medal in the C-4 1000 m event at the 2009 championships.
Simioncencu is a member of the CSA Steaua Bucharest club. He is 180 cm (5'11) tall and weighs 80 kg (176 lbs).
- Canoe09.ca profile
- ICF medalists for Olympic and World Championships - Part 1: flatwater (now sprint): 1936-2007.
- ICF medalists for Olympic and World Championships - Part 2: rest of flatwater (now sprint) and remaining canoeing disciplines: 1936-2007.
- Sports-reference.com profile