Alfred Lewis Vail (September 25, 1807 – January 18, 1859) was a machinist and inventor. Vail was central, with Samuel F. B. Morse, in developing and commercializing the telegraph between 1837 and 1844. Vail and Morse were the first two telegraph operators on Morse's first experimental line between Washington, DC, and Baltimore, and Vail took charge of building and managing several early telegraph lines between 1845 and 1848. He was also responsible for several technical innovations of Morse's system, particularly the sending key and improved recording registers and relay magnets. Vail left the telegraph industry in 1848 because he believed that the managers of Morse's lines did not fully value his contributions. His last assignment, superintendent of the Washington and New Orleans Telegraph Company, paid him only $900 a year, leading Vail to write to Morse, "I have made up my mind to leave the Telegraph to take care of itself, since it cannot take care of me. I shall, in a few months, leave Washington for New Jersey, ... and bid adieu to the subject of the Telegraph for some more profitable business."

Samuel Finley Breese Morse (April 27, 1791 – April 2, 1872) was an American contributor to the invention of a single-wire telegraph system based on European telegraphs, co-inventor of the Morse code, and an accomplished painter.

Samuel F.B. Morse was born in Charlestown, Massachusetts, the first child of the pastor Jedidiah Morse (1761–1826)—who was also a geographer—and Elizabeth Ann Finley Breese (1766–1828). His father was a great preacher of the Calvinist faith and supporter of the American Federalist party. He thought it helped preserve Puritan traditions (strict observance of Sabbath, among other things), and believed in the Federalist support of an alliance with Britain and a strong central government. Morse strongly believed in education within a Federalist framework, alongside the instillation of Calvinist virtues, morals and prayers for his first son.

After attending Phillips Academy in Andover, Massachusetts, Samuel Morse went on to Yale College to receive instruction in the subjects of religious philosophy, mathematics and science of horses. While at Yale, he attended lectures on electricity from Benjamin Silliman and Jeremiah Day. He supported himself by painting. In 1810, he graduated from Yale with Phi Beta Kappa honors.

Michael Lewis Vail (born November 10, 1951, in San Francisco, California) is a former Major League Baseball outfielder. He played from 1975-1984.

Vail was original drafted by the Los Angeles Dodgers in the 1970 amateur draft, but did not sign. A year later, he signed with the St. Louis Cardinals. On December 11, 1974, he was traded with Jack Heidemann to the New York Mets for Ted Martinez.

His first season in the Mets' organization, Vail won the 1975 International League Player of the Year award. He was called up to the majors by the New York Mets in August 1975 and got a hit in his first at bat against the Houston Astros. From there, he proceeded to set a modern Major League rookie record 23 game hit streak, which at the time was also the longest hitting streak in Mets' franchise history (both records have since been broken).

In the off-season, Vail was anointed the Mets' "player of the future," which prompted the Mets to trade star right fielder Rusty Staub to the Detroit Tigers to make room for Vail in their outfield.