Biologists, or those who study biology, have contributed many of the greatest findings in science. A biologist might study anything from cells to human evolution, but their focus always relates back to the study of life.

Medawar, Peter Brian (1815-1987), was a British zoologist who shared the 1960 Nobel Prize in physiology or medicine with Sir Macfarlane Burnet of Australia for their work on the body's rejection of tissue transplants.

Sharp, Phillip Allen (1944-) is an American biologist. He won the 1993 Nobel Prize in physiology or medicine for his discoveries relating to the structure and function of genes.

Carson, Rachel (Louise) (1907-1964), a United States biologist and writer. Silent Spring (1962) warns of the dangers of the indiscriminate use of chemical pesticides.

Dulbecco, Renato (1914-), an Italian-born American virologist, shared the 1975 Nobel Prize in physiology or medicine with David Baltimore and Howard Martin Temin of the United States for their research on how certain viruses affect the genes of cancer cells.

Dubos, Rene Jules (1901-1982), a United States scientist. In 1939 while working with soil bacteria, he developed tyrothricin, the first commercially produced antibiotic.

Lewontin, Richard Charles (1929-), an American evolutionary geneticist, introduced the study of molecular population genetics in the 1960's.

Levi-Montalcini, Rita (1909-), an Italian and American neurobiologist, became the fourth woman ever to be awarded the Nobel Prize in physiology or medicine, which she shared in 1986 with American biochemist Stanley Cohen .

Merrifield, Robert Bruce (1921-) is an American biochemist who won the 1984 Nobel Prize in chemistry for his method of producing peptides and proteins.

Waterston, Robert (1943-), an American geneticist, is an influential scientist and administrator.

Holley, Robert William (1922-1993) was an American biochemist. He shared the 1968 Nobel Prize in physiology or medicine with American biochemist Marshall Warren Nirenberg and Indian-born American chemist Har Gobind Khorana.

Hubbard, Ruth (1924-) is an Austrian-born American biologist and biochemist whose contributions to the study of the biochemistry and photochemistry of vision in vertebrates and invertebrates have greatly advanced the understanding of the field.

Luria, Salvador Edward (1912-1991), an Italian-born American biologist, shared the 1969 Nobel Prize in physiology or medicine with German-born American biophysicist Max Delbrück and American biologist Alfred D.

Waksman, Selman Abraham (1888-1973), a Russian-born United States microbiologist.

Wright, Sewall Green (1889-1988), was an American geneticist who greatly influenced the fields of genetics (the study of heredity) and evolutionary biology.

Benzer, Seymour (1921-), an American geneticist, is one of the founders of modern behavioral geneties.

Altman, Sidney (1939-), a Canadian-born American molecular biologist, transformed scientific thought about how living cells work and how life began millions of years ago.

Moore, Stanford (1913-1982) was an American biochemist who shared the 1972 Nobel Prize in chemistry with American scientist William Howard Stein for their pioneering research into the structure and chemistry of proteins.

Gould, Stephen Jay (1941-2002), a United States paleontologist, educator, and author.

Smith, Theobald (1859-1934), a United States pathologist. His investigations of infectious diseases led to the discovery, with F.

Weller, Thomas Huckle (1915-), an American virologist, was one of the first scientists to grow the poliomyelitis virus on tissues outside the body.

Morgan, Thomas Hunt (1866-1945), a United States geneticist. During 1909-15, Morgan and his assistants discovered three essential principles of genetics-sex linkage, linkage and crossing over, and sex determination.

Du Vigneaud, d$uY vēn'yō, Vincent (1901-1978), a United States biochemist. He received the 1955 Nobel Prize in chemistry for his isolation and synthesis of oxytocin, a hormone important in childbirth, and vasopressin, a hormone that regulates blood pressure.

Revelle, Roger (1900-1991), was an American oceanographer, a scientist who studies the ocean.

Peattie, Donald Culross (1898-1964), a United States botanist and author. His nature writings are marked by poetic prose, sage philosophy, and scientific accuracy.

Wetmore, Alexander (1886-1978), a United States museum official and authority on birds.