Cyrus Hall McCormick (February 15, 1809 - May 13, 1884) was an Irish American inventor. At the age 15, Cyrus invented a lightweight cradle for harvesting grain. He later had an idea to combine the steps involved in harvesting crops and developed the first mechanical reaper. He developed his idea by inventing a horse-drawn reaper that used back-and-forth-moving cutting blades. Next, a revolving device pushed the cut grain onto the back of the machine. He patented his "Improvement in Machines for Reaping Small Grain" on June 21, 1834. This machine made farming easier - and greatly increased the amount of food farmers could reap, made harvesting easier, lowered costs, and revolutionized farming. What was his company is now called Navistar international.
Charles Townes (1915-) is a Nobel Prize winning physicist (1964), inventor, and Irish American. Invented the laser.His study of and investigation of the properties of microwaves helped him invent the maser. A maser amplifies electromagnetic waves and was the basis for the laser. Townes holds patents for both the maser and the laser.