Speed skater Eric Heiden won 5 gold medals in the 1980 Winter Olympics by sweeping all 5 events. It was an unprecedented even that will probably never happen again.
Viktor Ahn, who was an athlete from Russia, won the most medals at the Sochi 2014 Winter Olympics, with 4 medals.
Micheal Phillips
Yes, and there has been one Canadian athlete that has won medals in both the Summer and Winter Olympics. Clara Hughes won medals in speed skating at the 2002 and 2006 Winter Olympics and medals in cycling at the 1996 Summer Olympics. Another is Hayley Wickenheiser who has played on the women's hockey team in the Winter Olympics and the softball team in the Summer Olympics.
Canada with 14 at the 2010 Winter Olympics in Vancouver.
Ole Einar Bjørndalen has won the most Winter Olympic medal with 13 total medals. The American with the most Winter Olympic medals is Apolo Anton Ohno with 8 total medals.
Michael Phelps
The United States won a record 37 medals at the 2010 Winter Olympics: 9 gold, 15 silver and 13 bronze.
Bjoern Dahlie of Norway (crosscountry skiing)
Estonia has won 6 medals in winter Olympics
Canada won 14 gold medals at the 2010 Winter Olympics.
There were no Winter Olympics in 2008.
Ireland didn't win any medals at the 2006 Winter Olympics.