Yes, Eugene Gendlin's work is related to both Gestalt therapy and field theory, although he is not typically associated with the development of either of these approaches.
Eugene Gendlin developed a philosophical and therapeutic approach known as "Focusing." Focusing is a technique that involves paying attention to the bodily sensations and feelings associated with a particular issue or problem. It encourages individuals to access their inner felt sense and explore it in a non-judgmental and open way. This approach is often used for self-exploration and personal growth, as well as in therapy.
Gendlin's work is related to Gestalt therapy in the sense that both approaches emphasize the importance of experiential exploration and awareness. In Gestalt therapy, the focus is on the present moment experience, and clients are encouraged to become aware of their thoughts, feelings, and bodily sensations. Focusing similarly encourages individuals to be present with their inner experiences, particularly the felt sense, which can be seen as a parallel concept to the Gestalt notion of "wholeness."
Regarding field theory, Gendlin's work can also be related, as his approach recognizes the influence of the individual's internal and external environment on their experiences. Field theory, as developed by Kurt Lewin, suggests that behavior and psychological phenomena are influenced by the totality of the individual's psychological and environmental factors, and Gendlin's Focusing technique takes into account these factors in the exploration of one's inner experiences.
So, while Eugene Gendlin's work is not a direct part of either Gestalt therapy or field theory, it shares some common philosophical and conceptual elements with both, making it related to these approaches in terms of its emphasis on experiential awareness and the role of the individual's environment in shaping their experiences.