Ralph Dupuy Lacoe was born on November 12, 1824, in Pennsylvania, USA.

He was a self-taught paleontologist who lived in the small anthracite coal town of Pittston, Pennsylvania. Financially successful, he retired from his banking business in 1865 and devoted himself to full-time fossil collecting, amassing over 100,000 specimens that he donated to various repositories, e.g., the United States National Museum. He also employed collectors and procured many private collections. In the 1880s and the 1890s, a few of his reports were published by the Wyoming Historical and Geological Society.

In 1860, he married Bridget Clary (1831–1872). He died on February 5, 1901, in Pittston, Luzerne, Pennsylvania.

Michel Lacroix was a Quebec architect who practiced architecture with John Bland, Roy LeMoyne, and Anthony Shine (Bland, LeMoyne, Shine, Lacroix architectes) in the 1970s and the early 1980s.

Lafayette was a photography studio based in Dublin, Ireland. The studio was founded in 1880 by James Stack Lauder (1853-1923), using the professional name James Lafayette. Lafayette was run by Lauder and his brothers, George, Edmund, and William. All of them learned photography from their father, Edmund Stanley Lauder (1828-1891), who had started a successful daguerreotype studio in Dublin in 1853. The studio found success quickly as a portrait studio, winning awards and positive reviews for their work, and attracting the attention of the Irish aristocracy and the British Royal family. In 1887, James Lafayette photographed Queen Victoria and was granted a Royal Warrant as "Her Majesty's photographer in Dublin," an honour that was renewed by the next two British monarchs. As the studio grew, they opened new locations in Glasgow (1890), Manchester (1892), London (1897), and Belfast (1900). In 1898, the business was formally incorporated as Lafayette Ltd. The company continued to experience significant success, particularly because of their ties to newspapers and magazines, which frequently used their photographs in their pages. The company saw some hardship beginning in the 1930s and closed informally in 1952 (officially in 1962). The Dublin studio, sold in 1951 to Walter Pannell, a former Lafayette employee, still exists today. The Victoria and Albert Museum and the National Portrait Gallery both hold significant collections of Lafayette negatives.

Joseph-Clovis-Kemner Laflamme was born on September 19, 1849, in Saint-Anselme, Lower Canada.

He was a Roman Catholic priest, educator, scientist, and writer. He studied at the Petit Séminaire de Québec (B.A., 1868), the Grand Séminaire de Québec (Ph.D., 1873) and was ordained a priest in 1872. In 1870, he became an instructor in natural history at the Petit Séminaire. In 1875, he started teaching physics at the Université Laval and was appointed chair of mineralogy and geology in the faculty of arts. He also taught geology, mineralogy, and botany. In 1881, he published a textbook for classical colleges, “Éléments de minéralogie et de géologie.” He also contributed numerous articles to L’Abeille, the seminary’s periodical. From 1891 to 1909, he was Dean of the Faculty of Arts. A brilliant speaker and able popularizer, he gave lectures before the Société Médicale de Québec, the Institut Canadien in Quebec, and the Literary and Historical Society of Quebec. He was president of the Royal Society of Canada from 1891 to 1892. He was a member of the Société géologique de France, the Société Française de Physique, the Société Scientifique de Bruxelles, and the Geological Society of America. In 1898, he was made a chevalier of the Légion d'honneur.

He died on July 6, 1910, in Quebec City, Quebec.