The staff liked the voice and therefore changed Frink to be more like Julius Kelp, both in appearance and personality – he became more nerdy, and went from evil to just mad.

The professor has received acclaim from critics, particularly for his bizarre inventions such as the hamburger earmuffs, and he has appeared on many reviewers' listings of their favorite supporting characters from The Simpsons.

[3] John Frink is generally depicted as Springfield's stereotypical nerdy, mad, and socially inept scientist, inventor, and mathematician.

[16] Frink also has a tendency to over-complicate simple matters and use or invent scientific terminology while expressing various concepts, e.g. "Father and I got along like positrons and antineutrinos!

[20] Frink often tries to use his mad and bizarre inventions to aid the town in its crises,[21] but they usually do not work or only make things worse.

[27] Some of Frink's unsuccessful inventions include his small remote-controlled plane that carries babies as passengers (it crashed),[28] the "Gamble-Tron 2000", a machine designed to predict pro football scores (after it predicts one team will win by 200 points, Frink physically attacks it on live television),[29] and a burglar-proof house that sprouts legs and runs away from potential danger (the legs of which collapsed causing the house to crash to the ground and catch fire).

[31][34] Frink often appears in the Treehouse of Horror Halloween episodes of The Simpsons,[35][36][37] which are not accepted as canon and always take place outside the normal continuity of the show.

[36] In "Treehouse of Horror XIV", it is revealed that Frink had a father who was killed by a shark, whom he brings back to life in the episode by piecing together his body parts.

Julius Kelp is a nerdy, mad professor, albeit not evil, and is often unsuccessful with his experiments, so Frink became more like that as the show progressed.

[42][43] The Simpsons creator Matt Groening told TV Guide that "He was just written as a mad scientist character until Hank did the voice, and suddenly he became this nutty professor persona.

[7] Fort Worth Star-Telegram's Robert Philpot called the professor one of the five best supporting characters on The Simpsons, writing that "Springfield's mad scientist is a triumph of style over substance, with Hank Azaria giving him a ripoff Jerry Lewis voice that reminds you why we once thought Lewis was funny.

"[51] On their list of the top twenty-five peripheral Simpsons characters, IGN's Eric Goldman, Dan Iverson, and Brian Zoromski listed Frink at number fourteen, commenting that he fits nicely into the Simpsons universe "as the town's brilliant mad scientist."

[14] The Sydney Morning Herald's David Hollingworth profiled Frink in his list of "TV's great tech figures", writing that apart from being smart, the professor is best known for his "rather idiosyncratic speech patterns – hmmguyvin-whey-hey.

[52] On the same list, Goss also featured Frink's automatic phone dialer, intra bovine ice-cream maker (an invention that is inserted into a cow and uses the four stomachs to mix the various ingredients), and hamburger earmuffs.

[52] In a profile about Frink, the publication UGO Networks wrote: "Where would the town be without your Jerry Lewis/Julius Kelp-inspired voice and antics?

"[53] Howard Waldrop and Lawrence Person of Locus listed the scene in The Simpsons Movie that features Frink's drilling machine invention as one of the highlights of the film.

[61] He has also been turned into a Halloween-inspired action figure that was packaged with Kids Meals at Burger King in October and November 2002.

through all calculations, allowing you to mix units of measure transparently, and helps you easily verify that your answers make sense.