Jacob Cohen (1962–1998) was a prominent American psychologist and statistician known for his contributions to the fields of statistics, psychology, and research methodology. One of his most significant contributions is the concept of effect size, which quantifies the size of a difference or a relationship in a population. Effect size measures are vital for understanding the practical significance of research findings beyond traditional hypothesis testing.

Jaguar was a high-performance supercomputer located at the Oak Ridge National Laboratory (ORNL) in Tennessee, USA. It was one of the leading supercomputers in the world and played a significant role in scientific research and simulations across various fields, including physics, climate modeling, biology, and materials science. Originally built in 2005, Jaguar underwent several upgrades and enhancements throughout its operational life.

James A. Berlin was a notable figure in the field of rhetoric and composition. He was an influential scholar and teacher who contributed significantly to the understanding of writing, particularly in the context of education and composition studies. Berlin is well-known for his theories on the teaching of writing and his critiques of traditional approaches to rhetoric and composition.

James Cameron is a Canadian filmmaker, director, producer, and screenwriter, renowned for his work in the film industry, particularly in the science fiction and action genres. He is best known for directing some of the highest-grossing films in cinematic history, including "Titanic" (1997) and "Avatar" (2009), both of which received critical acclaim and numerous awards.

Janet Vaughan (1899–1993) was a prominent British physician and medical researcher known for her contributions to medicine, particularly in the fields of hematology and blood transfusion. She played a significant role during World War II as a key figure in the development of blood banking and transfusion practices, which helped save countless lives.

János Komlós is a Hungarian mathematician known for his contributions to various fields within mathematics, particularly in combinatorics, probability theory, and number theory. He has been involved in significant research that often intersects these areas and has also contributed to the development of algorithms and probabilistic methods in combinatorial mathematics. In addition to his research, Komlós has had a notable academic career as a professor, teaching and mentoring students in mathematics.

Jeanette Grasselli Brown is a well-known chemist and educator notable for her contributions to the field of chemistry and her efforts to promote science education. She is recognized for her work in the area of chemical education and has served in various academic and leadership roles throughout her career. Additionally, she has been involved in promoting the involvement of women and underrepresented groups in the sciences. Brown has received various awards for her achievements and has made significant contributions to both research and teaching in the discipline of chemistry.

Jean-Yves Girard is a prominent French logician and philosopher, known for his significant contributions to the fields of mathematical logic, proof theory, and category theory. Born on July 29, 1939, Girard has developed influential concepts and systems within these disciplines. One of his notable contributions is the development of Linear Logic, which he introduced in the 1980s.

Jessamine S. Whitney was an American novelist and author known primarily for her works in the late 19th and early 20th centuries. She wrote novels, many of which were published in serialized form in periodicals. Whitney is often recognized for her contributions to American literature during her time, exploring themes related to women’s roles in society, personal growth, and complex relationships.

"Jewels in the Crown" can refer to a few different things depending on the context. Here are a couple of common interpretations: 1. **Historical Reference**: In a historical context, "Jewels in the Crown" often refers to the valuable territories or assets that were part of the British Empire, particularly India. The phrase highlights India's significance to the British Empire during the colonial period, as it was seen as a vital source of wealth, resources, and trade.

Jodi Lapidus does not appear to be a widely recognized public figure as of my last training cut-off in October 2023. It's possible that she could be a private individual or a lesser-known personality.

Johann Christian Wernsdorf (1746-1817) was a German classical scholar and philologist known for his contributions to the study of classical antiquity and literature. He held a prominent position in the field of classical studies during his time and was also associated with various academic institutions. Wernsdorf's work often focused on the interpretation and analysis of ancient texts, and he is noted for his ability to engage with the works of classical authors.

Johannes Reinke (1834–1916) was a notable German botanist and professor, recognized for his contributions to the field of botany, particularly in the study of plant morphology and taxonomy. He is perhaps best known for his work on plant classification and his efforts in the exploration of plant diversity. Reinke played a significant role in advancing botanical education in Germany and was instrumental in various botanical institutions during his career.

John D. Norton is a prominent philosopher of science, particularly known for his work in the philosophy of physics. He has contributed significantly to discussions on the nature of scientific theories, the foundations of thermodynamics, and the interpretation of classical and contemporary physics. Norton has explored topics such as the structure of scientific explanation, the role of space and time in physics, and the relationship between scientific theories and empirical evidence.

John Browning was a notable scientific instrument maker active during the 17th century. He is recognized for his craftsmanship and contributions to the field of scientific instrumentation, particularly in the area of telescopes and other optical devices. Browning was known for producing high-quality instruments that were used for various scientific observations and research.

As of my last knowledge update in October 2023, there doesn't appear to be any widely recognized or notable figure by the name of John Cayo Evans. It's possible that he could be a private individual or someone who has gained prominence after that time.

John Edwin McGee is not a widely recognized public figure or a term with a standard definition, based on the information available up to October 2023.

John Hammersley was an influential British mathematician known for his work in the fields of statistics, probability theory, and mathematical modeling. He made significant contributions to various areas, including the development of techniques in Monte Carlo methods and the study of random processes. Hammersley also played a role in the establishment of the field of statistical mechanics. He is perhaps best known for the Hammersley process, named after him, which is a specific type of stochastic process.