Scientist, and Medical Researcher. He was a pediatrician whose research determined means of combating disease, most notably the two childhood diseases, colic and celiac. He will be best remembered for writing and publishing the medical textbook, "The Management Of Celiac Disease" (1951), along with his son, Dr. Merrill Patterson Haas (1912-1985), which is considered the most comprehensive medical text that has ever been written on celiac disease. With 670 references to published research, the book described celiac disease more completely than had ever been done before. He was born one of five children as Sidney Valentine Haas to Simon Haas (1835-1876), and his wife Bertha Blumenthal Haas (1837-1904), in Chicago, Illinois, on February 14, 1870. He was educated locally, and when he was six years old he moved with his parents and siblings and settled in New York City, New York. He then attended the prestigious New York University Medical School in New York City, New York, and Columbia University's College of Physicians and Surgeons in New York City, New York, where he received his medical degree. He then commenced his practice of medicine shortly thereafter at the Vanderbilt Clinic at New York Presbyterian Hospital in New York City, New York, where he served under Dr. Abraham Jacobi (1830-1919), who was a pioneer in pediatrics. He was also highly influenced by another well-known pediatrician and colleague, Dr. Emmett Holt (1894-1974), at the Mount Sinai Hospital in New York City, New York, who pushed him while he was still a young intern to pursue pediatrics further. He also worked at the Lebanon and Riverside Hospital, was a Professor of Pediatrics at New York Polyclinic, and also worked for several years with the New York City Health Department, as well as being an attending physician and consultant at some of New York City's largest hospitals. He became interested in the diseases found in young children while working and studying in some of these medical institutes. He introduced the use of the belladonna plant for its extract, atropine, to relieve severe colic infants in 1918. He also introduced a banana diet to cure celiac disease, which prevented small children from digesting needed starchy, which he wrote a medical paper on in 1924. In detail, he correctly concluded that bananas enabled the breaking up of starches and the conversion of cane sugar into fruit sugar, which prevented the debilitating diarrhea of celiac disease. His groundbreaking research also led to the development of the Specific Carbohydrate Diet, which is a nutritional regimen that restricted the use of complex carbohydrates including disaccharides and polysaccharides, and eliminated refined sugar, gluten, and starch from the diet. He also never accepted the finding that gluten was the damaging part of wheat, he insisted it was starch and called the discovery about gluten a, "disservice." Besides writing and publishing the medical textbook, "The Management Of Celiac Disease" (1951), along with his son, Dr. Merrill Patterson Haas (1912-1985), and the medical paper on his research on celiac disease in 1924, he also wrote numerous other medical articles during his medical career. During his medical career as a pediatrician, he was also credited with saving many children's lives by devising successful treatments for colic and celiac disease. Thanks to his innovations, only about 25 percent of celiac victims passed away. He only lost four of his own patients before his breakthrough methods. His medical career lasted for over 50 years until his retirement from his medical practice in about 1962. He passed away in St. Mary's Hospital in Orange, New Jersey, on November 30, 1964, at the age of 94. Following his death, his funeral service was held at the Universal Funeral Home in Manhattan, New York, and he was buried in the Family Mausoleum in Mount Pleasant Cemetery in Hawthorne, New York. On his death, his obituary was printed in all leading New York City newspapers, including "The New York Times" and in "Time Magazine," which described him as a "pioneer in pediatrics" and an "honored pediatrician." He was married to Helen Marie Patterson Haas (1874-1955), in Manhattan, New York, on February 19, 1901, and the couple had four children together, Sidney Valentine Haas Jr. (1907-1987), Bertha Marie Haas (1911-), Gilbert Miller Haas (1912-1988), and Merrill Patterson Haas (1912-1985). His wife Helen predeceased him and passed away in Peekskill, New York, on September 20, 1955, at the age of 81, and she is buried with her husband in the Family Mausoleum in Mount Pleasant Cemetery in Hawthorne, New York.