Max Miedinger/Eduard Hoffmann
Linotype Helvetica, Linotype Helvetica Neue series
Haas Grotesk, Geneva, Helios, Newton, Megaron, Vega, BT Swiss 721, Nimbus Sans, Arial
As Erik Spiekermann says, this is the typeface designed to show no emotion; later extended into a family of about 50 variants by the addition of extra weights and styles, often by other hands. Max Miedinger was initially asked by Eduard Hoffmann to revamp the old Haas Grotesk in 1951, and it was released under that name in Switzerland. When the Haas Foundry became a subsidiary of Stempel/Linotype in Germany, it was renamed Helvetia. This type was subsequently cross-licensed and sold extensively in overseas markets, becoming a standard in the process, and copied under differing names by almost all of the typesetting equipment suppliers. Now widely distributed as a default font with computer operating systems.