John Rognes is a mathematician known for his work in algebraic topology, particularly in the areas of stable homotopy theory and structure in homotopy groups. He has made significant contributions to understanding the relationships between different topological spaces and their homotopy types. Rognes has also worked on topics related to operads and their applications in homotopy theory. He is affiliated with the University of Oslo, and his research often emphasizes the interplay between algebraic and geometric methods in topology.

John Rainwater is not a widely recognized figure or concept that I have specific information on as of my last update in October 2023. It's possible that you are referring to a person, business, or concept that may not have been well-documented or that has emerged recently.

John Nunn is a notable figure, primarily known for his achievements in the fields of chess and mathematics. He is a British chess player who has achieved the title of International Master. Nunn is also recognized for his contributions to chess literature, having authored several books on chess strategy and tactics. In addition to his chess prowess, Nunn has an academic background in mathematics. He has worked as a mathematician and has published research in this field.

John L. Kelley was an American mathematician and statistician known for his contributions to the fields of statistics and operations research. He is particularly noted for his work in queuing theory and the development of the Kelly criterion, which is a formula used in gambling and investment for determining the optimal size of a series of bets. The Kelly criterion aims to maximize the logarithm of wealth over time, balancing the risks and rewards of various betting or investment strategies.

John Hempel could refer to various individuals, but without specific context, it's difficult to determine which one you mean. If you're referring to someone notable in a particular field (such as science, sports, politics, etc.), please provide more details so I can assist you better. If it's a fictional character or a lesser-known individual, additional context would also be helpful.

John Etnyre is a mathematician known for his contributions to the field of topology, particularly in low-dimensional topology and knot theory. He has worked on various topics within these areas, including the study of 3-manifolds and the relationships between different types of knots and links. Etnyre has published numerous research papers and is recognized for his influence in the mathematical community through both his research and his teaching.

John Edwin Luecke appears to be a less widely known individual, and there may not be a significant amount of publicly available information about him. If you are seeking information about a specific John Edwin Luecke, such as a scholar, artist, or professional in a certain field, please provide additional context or details.

John Coleman Moore is a name that might refer to multiple individuals, but without additional context, it's difficult to provide a specific answer.

Johannes de Groot could refer to a few different things, depending on the context. One common reference is to a Dutch botanist known for his contributions to the study of plant species, particularly in the Netherlands and surrounding areas. Another possibility could be a person's name, as it is a relatively common Dutch name.

Johann Benedict Listing (1808-1882) was a German mathematician known for his significant contributions to the fields of topology and geometry. He is particularly noted for being one of the founders of topology, a branch of mathematics that deals with the properties of space that are preserved under continuous transformations. Listing introduced several important concepts, including the idea of "topological properties" and the distinction between different types of geometrical figures.

Joel Hass is a mathematician known for his contributions to the fields of calculus and mathematics education. He is particularly recognized for co-authoring several mathematics textbooks, including "Calculus," which is widely used in college-level courses. Hass has been involved in efforts to improve how calculus is taught and understood, emphasizing concepts and practical applications. In addition to his work in education, he has been active in various mathematical research areas.

Joan Birman is a notable American mathematician recognized for her contributions to the fields of topology and geometry, particularly in relation to knot theory. Born on May 18, 1927, she was influential in advancing the study of mathematical knots, which has applications in various scientific disciplines, including biology and physics. Birman is also known for her work on braid groups and their connections to other areas of mathematics.

Jerome Levine could refer to various individuals, as it is not an uncommon name. However, without more specific context, it's difficult to determine which Jerome Levine you might be referring to. He could be a notable figure in fields like academia, business, healthcare, or another area.

As of my last knowledge update in October 2021, I do not have specific information about an individual named Jennifer Schultens. It's possible she may be a private individual, or she could have become notable in some field after that date.

Jennifer Hom is a mathematician known for her work in the fields of topology, geometry, and mathematical visualization. She earned her Ph.D. from Harvard University, where she studied under the supervision of Robion Kirby. Hom is known for her contributions to knot theory and related areas, including work on Heegaard Floer homology and gauge theory. In addition to her research, she is also involved in mathematics education and outreach, promoting engagement and interest in mathematics among students and the public.

Jeffrey Weeks is a mathematician known for his work in the fields of topology and geometry, particularly in the study of three-dimensional manifolds. He is well-regarded for his contributions to the understanding of hyperbolic 3-manifolds and for his development of software tools for mathematical visualization, such as SnapPea, a program used for studying hyperbolic structures on 3-manifolds.

Jeffrey H. Smith could refer to multiple individuals, as it is a common name. Without additional context, it's difficult to specify which Jeffrey H. Smith you are referring to.

Jean Lannes is a French mathematician known for his contributions to algebraic topology and homotopy theory. He has worked on various topics, including stable homotopy theory, operads, and the study of certain types of algebraic structures in relation to topological spaces. Lannes is particularly recognized for his work on the Lannes-Treumann theory, which relates to the representation of stable homotopy groups and other areas of algebraic topology.

Jean Cerf is a French mathematician known for his contributions to topology, particularly algebraic topology, geometric topology, and mathematical logic. He has worked on various topics, including the study of manifolds, homotopy theory, and the relationships between topology and other areas of mathematics. Additionally, it is worth noting that "Jean Cerf" may refer to different people or subjects depending on the context, such as a specific individual’s work or achievements in a related field.

Jean-Claude Sikorav is a French mathematician known for his contributions to the field of mathematics, particularly in topology and functional analysis. He has worked on various topics, including fixed point theory and the mathematical modeling of dynamical systems. However, there may be limited widely available information on his work outside specialized academic circles.