The Agile community is vast and diverse, and there are numerous individuals who are considered influential and respected Agile experts. These experts have made significant contributions to the field of Agile methodologies and have played instrumental roles in shaping the Agile movement. Some of the defacto Agile experts include:

1. **Uncle Bog## Robert Cecil Martin (born 5 December 1952), colloquially called "Uncle Bob", is an American software engineer, instructor, and author. He is most recognized for promoting many software design principles and for being an author and signatory of the influential Agile Manifesto.

2. Ken Schwaber: Ken Schwaber is one of the co-founders of Scrum, one of the most popular Agile frameworks. He has been a prominent figure in the Agile community and has authored several books on Agile and Scrum.

3. Jeff Sutherland: Jeff Sutherland is another co-founder of Scrum and a well-known Agile thought leader. He has contributed to the development and promotion of Scrum and has written extensively about Agile practices.

4. Alistair Cockburn: Alistair Cockburn is an Agile Manifesto signatory and an expert in Agile methodologies. He is known for his work on Crystal methodologies and has been involved in various Agile-related activities.

5. Martin Fowler: Martin Fowler is an influential software engineer and author who has written extensively on Agile development and software design. He is a strong advocate of Agile practices and has played a significant role in promoting Agile in the software development community.

6. Ron Jeffries: Ron Jeffries is one of the signatories of the Agile Manifesto and an early adopter of Extreme Programming (XP). He has been instrumental in advocating Agile principles and practices, especially in the context of XP.

7. Mary Poppendieck: Mary Poppendieck is an expert in Lean Software Development and has written books on applying Lean principles to software development. Her work has had a significant impact on the Agile community.

8. Mike Cohn: Mike Cohn is a well-known Agile trainer, coach, and author. He is the founder of Mountain Goat Software and has written several popular books on Agile and Scrum.

9. Lyssa Adkins: Lyssa Adkins is a prominent Agile coach, trainer, and author. She is known for her work on Agile coaching and has written books that have helped many Agile practitioners in their coaching journeys.

10. Kent Beck: Kent Beck is one of the creators of Extreme Programming (XP) and a signatory of the Agile Manifesto. He has made significant contributions to the Agile community and is the author of "Extreme Programming Explained," a seminal book on XP.

11. Esther Derby: Esther Derby is an Agile coach, facilitator, and author who has been active in the Agile community for many years. She has written books on Agile team dynamics and organizational change.

These experts, along with many others in the Agile community, have been instrumental in promoting Agile values, principles, and practices, helping organizations and teams adopt Agile methodologies to achieve better outcomes in software development and beyond.