| Pioneer in calculus notation | 28 |
| Pioneer in conditioning research | 32 |
| Pioneer in cool jazz | 20 |
| Pioneer in Cubism | 17 |
| Pioneer in Dadaism | 18 |
| Pioneer in development of celluloid | 35 |
| Pioneer in electrical science | 29 |
| Pioneer in electricity | 22 |
| Pioneer in electrodynamics | 26 |
| Pioneer in fluid mechanics | 26 |
| Pioneer in high-tension electricity | 35 |
| Pioneer in Hollywood | 20 |
| Pioneer in I.Q. testing | 23 |
| Pioneer in instant messaging | 28 |
| Pioneer in late-night TV | 24 |
| Pioneer in literary realism | 27 |
| Pioneer in mass-production methods | 34 |
| Pioneer in mathematical logic | 29 |
| Pioneer in medicine | 19 |
| Pioneer in New Criticism | 24 |
| Pioneer in number theory | 24 |
| Pioneer in pistol-grip hair dryers | 34 |
| Pioneer in probability | 22 |
| Pioneer in psychoanalysis | 25 |
| Pioneer in quadraphonic music | 29 |
| Pioneer in quadraphonic records | 31 |
| Pioneer in quantum theory | 25 |
| Pioneer in scholasticism | 24 |
| Pioneer in side-scrolling video games | 37 |
| Pioneer in smooth jazz | 22 |
| Pioneer in surrealism | 21 |
| Pioneer in synthesizers | 23 |
| Pioneer in the development of nuclear power | 43 |
| Pioneer in the manufacture of steel plows | 41 |
| Pioneer in the math of sudoku | 29 |
| Pioneer in the Nevada gaming industry | 37 |
| Pioneer in the occult | 21 |
| Pioneer in U.S. cotton industry | 31 |
| Pioneer in vaccination | 22 |
| Pioneer in wireless telegraphy | 30 |
| Pioneer item | 12 |
| Pioneer missionary in California | 32 |
| Pioneer movie director | 22 |
| Pioneer name in video games | 27 |
| Pioneer of ambient music Brian | 30 |
| Pioneer of antiseptic surgery | 29 |
| Pioneer of art's Neue Sachlichkeit movement | 47 |
| Pioneer of cool jazz | 20 |
| Pioneer of Dadaism | 18 |
| Pioneer of detective fiction | 28 |
| Pioneer of late-night talk shows | 32 |
| Pioneer of New Journalism | 25 |
| Pioneer of projectile physics | 29 |
| Pioneer of slapstick cinema | 27 |
| Pioneer of telegraphy | 21 |
| Pioneer of the Chinese Republic | 31 |
| Pioneer of the programmable computer | 36 |
| Pioneer of the twist | 20 |
| Pioneer of TV comedy | 20 |
| Pioneer org. | 12 |
| Pioneer performance artist | 26 |
| Pioneer photojournalist | 23 |
| Pioneer physicist Alessandro | 28 |
| Pioneer pilots | 14 |
| Pioneer planter | 15 |
| Pioneer plow pullers | 20 |
| Pioneer plowman | 15 |
| Pioneer preservationist | 23 |
| Pioneer products | 16 |
| Pioneer radiation researcher | 28 |
| Pioneer recording engineer Light | 32 |
| Pioneer reggae musician | 23 |
| Pioneer restaurant reviewer Duncan | 34 |
| Pioneer rug material | 20 |
| Pioneer sci-fi man et al. | 25 |
| Pioneer sci-fi writer | 21 |
| Pioneer space primate | 21 |
| Pioneer suffragist | 18 |
| Pioneer suffragist's initials | 33 |
| Pioneer talk show host | 22 |
| Pioneer transportation | 22 |
| Pioneer transports | 18 |
| Pioneer TV personality | 22 |
| Pioneer vehicle | 15 |
| Pioneer video game | 18 |
| Pioneer video game systems | 26 |
| Pioneer video-game name | 23 |
| Pioneer wares | 13 |
| Pioneer's cap supplier | 26 |
| Pioneer's desire | 20 |
| Pioneer's digs | 18 |
| Pioneer's direction | 23 |
| Pioneer's hat material | 26 |
| Pioneer's heading | 21 |
| Pioneer's hearing? | 22 |
| Pioneer's org. | 18 |
| Pioneer's piece | 19 |
| Pioneer's place | 19 |
| Pioneer's problem | 21 |
| Pioneer's purchase | 22 |