In this dissertation, we describe our investigation into exciton-polariton Bose-Einstein condensation in organic materials. Exciton-polaritons are hybrid quasiparticles arising from the interaction of an exciton with the electromagnetic field. As bosons, they undergo Bose-Einstein condensation at a critical density. In the first part of this work, we address the question of whether polariton condensates in organic materials can be considered true Bose-Einstein condensates. We build on this work to investigate the mechanism of condensation in the semiconducting polymer poly(9,9-di-n-octylfluorenyl-2,7-diyl). Finally, we consider reports of enhanced internal conversion rates in zinc tetraphenylporphyrin through strong light-matter coupling and attempt to ascertain the origin of this effect and its implications for condensation and polariton chemistry.