Κonstantina Kosmidou is a board member (since 2005) and currently International Relations Officer of OLKE
. From 2011 to 2013 she was the president of OLKE. On Konstantina's initiative, the first LGBTI Social Centre, “The Athens Rainbow House”, became a reality at 2012. As a founding and board member of NELFA (Network of European LGBTI Families), Konstantina managed the joining of many countries from the southeast European Region. Alongside Konstantina's LGBTI activism, she also ran as the first openly LGBTI candidate in Greece for the European Elections in 2014.