One famous author is William Gibson. While he may not be strictly a biomechanical science fiction author, his works like 'Neuromancer' have elements that touch on the idea of the body and technology merging, which is related to biomechanical concepts. Additionally, Greg Bear has also dabbled in this area, with his works exploring the scientific and philosophical aspects of biomechanical entities and how they interact with the world around them.
Well, Pat Cadigan is quite well - known in this genre. She has written stories that explore the relationship between humans and biomechanical enhancements. Also, there's Bruce Sterling, who has incorporated biomechanical ideas into his works, often looking at the impact of such technology on culture and society. His works are known for their unique take on the future where biomechanics plays a big role.
Richard Morgan is one. His books often feature gritty, complex worlds with biomechanical elements. Another is Neal Asher, who creates elaborate universes filled with biomechanical creatures and advanced technologies.