Seelan, also known as Sabharatnam Sivayoganathan, is a longstanding human rights defender in Sri Lanka. During the ethnic conflict and civil war in Sri Lanka, Seelan supported victims of human rights violations in their fight for justice, many of whom are from vulnerable and impoverished communities. Seelan is an active committee member of the Batticaloa district NGO Consortium, a committee member of Transparency International Sri Lanka and the President of Batticaloa district civil society forum. Seelan has been part of several initiatives in relation to peace-building, transitional justice and the reconciliation processes. He has been vocal about the reprisals and intimidation faced by regional journalists, military land grabbing, militarization and the Presentation of Terrorism Act.