Almost no one talks about Edmund Husserl but he was his mentor & a MAJOR influence on Martin Heidegger:

Edmund Husserl, the founder of phenomenology, profoundly influenced Martin Heidegger, particularly in the early stages of Heidegger’s intellectual development.
•Husserl’s call to “return to the things themselves” through a direct examination of experience greatly inspired Heidegger. Husserl’s method of bracketing (epoché) encouraged a suspension of preconceived notions to focus on the structures of consciousness, which Heidegger adapted into his own explorations of Being.
•Heidegger adopted phenomenology’s descriptive and interpretive methods but moved away from its focus on consciousness to examine Being as it is lived in the world.
•Husserl emphasized intentionality, the idea that consciousness is always directed toward something. This influenced Heidegger’s understanding of human existence (Dasein) as being inherently situated in a world of meaning and relations.
•Both Husserl and Heidegger rejected Cartesian dualism, which separates mind and body. Husserl’s phenomenology sought to bridge this divide, and Heidegger took this further, emphasizing the embodied and practical nature of human existence.

•Heidegger criticized Husserl’s focus on transcendental consciousness as overly abstract and detached from everyday life. Heidegger’s Being and Time (1927) sought to ground phenomenology in the lived experience of Dasein, emphasizing the existential dimensions of being, such as anxiety, time, and death. Instead of focusing on how phenomena appear to consciousness (Husserl’s concern), Heidegger delved into the question of Being itself and how it unfolds historically and contextually. Heidegger was concerned with what he called the historicity of man. 
•Husserl’s studies on internal time-consciousness influenced Heidegger’s interpretation of Being as fundamentally temporal. However, Heidegger moved away from Husserl’s idealism and developed a more existential and historical understanding of time. 

•While Heidegger dedicated Being and Time to Husserl, their relationship soured due to Heidegger’s philosophical divergence and his political associations during the Nazi period. Despite this, Husserl’s work remained a critical foundation for Heidegger’s early thinking.

Husserl’s phenomenology provided the methodological and conceptual framework that Heidegger reinterpreted and expanded into his existential phenomenology, marking both a continuity and a radical departure from his mentor’s ideas.