Louis Henry Sullivan (September 3, 1856 – April 14, 1924) was an American architect, and has been called the "father of skyscrapers" and "father of modernism" He is considered by many as the creator of the modern skyscraper, was an influential architect and critic of the Chicago School, was a mentor to Frank Lloyd Wright, and an inspiration to the Chicago group of architects who have come to be known as the Prairie School. Along with Henry Hobson Richardson and Frank Lloyd Wright, Sullivan is one of "the recognized trinity of American architecture".

Louis Henry Sullivan was born to an Irish-born father, Patrick Sullivan, and a Swiss-born mother, née Andrienne List, both of whom had immigrated to the United States in the late 1840s. He grew up living with his grandmother, Anna Mattheus List, in South Reading (now Wakefield), Massachusetts. Louis spent most of his childhood learning about nature at his grandparent’s farm. In the later years of his primary education, his experiences varied quite a bit. He would spend a lot of time by himself wandering around Boston. He explored every street looking at the surrounding buildings. This was around the time when he developed his fascination with buildings and he decided he would one day become a structural engineer/architect. While attending high school Sullivan met Moses Woolson, whose teachings made a lasting impression on him, and nurtured him until his death. After graduating from high school, Sullivan studied architecture briefly at the Massachusetts Institute of Technology. Learning that he could both graduate from high school a year early and pass up the first two years at the Massachusetts Institute of Technology by passing a series of examinations, Sullivan entered MIT at the age of sixteen. After one year of study, he moved to Philadelphia and talked himself into a job with architect Frank Furness.

Frank Lloyd Wright (born Frank Lincoln Wright, June 8, 1867 – April 9, 1959) was an American architect, interior designer, writer and educator, who designed more than 1,000 structures and completed 500 works. Wright believed in designing structures which were in harmony with humanity and its environment, a philosophy he called organic architecture. This philosophy was best exemplified by his design for Fallingwater (1935), which has been called "the best all-time work of American architecture". Wright was a leader of the Prairie School movement of architecture and developed the concept of the Usonian home, his unique vision for urban planning in the United States.

His work includes original and innovative examples of many different building types, including offices, churches, schools, skyscrapers, hotels, and museums. Wright also designed many of the interior elements of his buildings, such as the furniture and stained glass. Wright authored 20 books and many articles and was a popular lecturer in the United States and in Europe. His colorful personal life often made headlines, most notably for the 1914 fire and murders at his Taliesin studio. Already well known during his lifetime, Wright was recognized in 1991 by the American Institute of Architects as "the greatest American architect of all time."

Frank Lloyd (2 February 1886, Glasgow, UK – 10 August 1960, Santa Monica, California, United States) was a film director, scriptwriter and producer. Lloyd was among the founders of the Academy of Motion Picture Arts and Sciences, and its president between 1934 and 1935.

Frank Lloyd was Scotland's first Academy Award winner and is unique in film history having received three Oscar nominations in 1929 for his work on a silent film (The Divine Lady), a part-talkie (Weary River) and a full talkie (Drag). He won for The Divine Lady. He was nominated and won again in 1933 for his adaptation of Noël Coward's Cavalcade and received a further Best Director nomination in 1935 for perhaps his most successful film, Mutiny on the Bounty.

In 1957, Lloyd was awarded The George Eastman Award, given by George Eastman House for distinguished contribution to the art of film.

Frank Lloyd Wright, Jr. (March 30, 1890, Oak Park, Illinois – May 31, 1978, Santa Monica, California), commonly known as Lloyd Wright, was an American landscape architect and architect, active primarily in Los Angeles and Southern California. His name is frequently confused with that of his more famous father, Frank Lloyd Wright.

Lloyd Wright's mother was Frank Lloyd Wright's first wife, Catherine Lee "Kitty" Tobin. He was the eldest son of the couple, and grew up in the surroundings of the 1889 Wright home and studio in Oak Park. Lloyd briefly attended the University of Wisconsin in Madison, before leaving for a job at the Boston-based landscape architecture firm of the Olmsted Brothers. Specializing in botany and horticulture, he continued to pursue the interrelation of landscape and buildings through his life.

He settled in Southern California around 1911, followed by his younger brother John Lloyd Wright. The Olmsteds had sent him to assist with the landscape design of the 1915 Panama-California Exposition in San Diego with architects Irving Gill, Bertram Goodhue, and Carleton Winslow. The exposition's principal buildings and gardens still remain in Balboa Park. Landscape design led him to work with Los Angeles architect William J. Dodd and in San Diego with Irving Gill, the latter another master architect and mentor to his design career.

Louis Henry (1911 – 1991) was a French historian. Founder of the historical demography and one-place study fields. His 1956 book co-written with Michel Fleury, Des registres paroissiaux à l'histoire de la population. Manuel de dépouillement et d'exploitation de l'état civil ancien lied foundation for studies in those areas.

Henry was proposing that it was possible to reconstruct the population of France from 1670 to 1829. He devised more advanced methods then extraction of data from records, together with rules to correct bias and indicate which family histories could be used for different kinds of statistical analysis.

Henry is also responsible for the concept of natural fertility, which became important for how demographers came to understand the idea of fertility control.

Natural fertility