Why did Husserl investigate the transcendental ego?

Edmund Husserl investigated the transcendental ego as part of his broader project to establish philosophy as a "rigorous science" free from all presuppositions. By employing the transcendental reduction, Husserl sought to move beyond mere psychological descriptions to reach the ground of all meaning (German Sinn).13

For Husserl, the transcendental ego represents "pure consciousness," which serves as the foundation for the constitution of all objects of knowledge. He believed that by returning to this ego, a philosopher could achieve the insight necessary to understand how meaning is created and how it is structured through various acts of consciousness, such as time awareness. Ultimately, Husserl viewed the transcendental ego as the essential methodology for ensuring absolute certainty in philosophical inquiry, allowing him to describe how the thinking subject "constitutes" the world rather than simply observing it from a distance.2134