Soren Kierkegaard was a profound and prolific 19th century writer and philosopher in the Danish Golden Age of intellectual and artistic activity. He wrote about how we choose to live and what it means to be alive, centred in the individual or “existing being”. He is regarded as the father of Existentialism. The stress of subjectivity is one of Kierkegaard’s main contributions. His concept of anxiety or angst is one of the most profound pre-Freudian works of psychology. His most popular work includes the leap of faith, the concept of angst, the three stages on life (aesthetic, ethical, religious), among others.