Dr. Heinz Doofenshmirtz, often called "Doof" for short, also known as Professor Time, is a fictional character from the American animated television series Phineas and Ferb and Milo Murphy's Law.

He was originally depicted as an incompetent evil scientist intent on conquering the "entire Tri-State Area" by creating obscure but nefarious inventions.

[8] A typical episode features Doofenshmirtz hatching an evil scheme or invention that he often links to a "back story" from his youth in the fictional village of Gimmelshtump, Drusselstein.

Drusselstein is loosely based on countries in Western-Central Europe like Germany, Austria, Hungary and Switzerland, evidenced by buildings with Fachwerkhäuser architecture, the citizens speaking German in grammatical form or how the food, dresses and carnivals are similar to that of Fasching or even Oktoberfest.

This shot usually serves to get rid of Phineas and Ferb's invention for that episode, preventing their sister, Candace, from "busting" them by showing their creations to their mother.

Another example, which is perhaps the most famous, is in the 2014 special "Phineas and Ferb Save Summer", when Doofenshmirtz builds an -inator that uses the mass of the planet Jupiter to move the Earth away from the Sun into an early autumn.

[15] When Jeff "Swampy" Marsh and Dan Povenmire worked on the Nickelodeon animated series Rocko's Modern Life, they always included a song/musical number and an action/chase scene.

They wanted to incorporate this trait in Phineas and Ferb,[16] and used a platypus secret agent,[17] due to its interesting appearance[18] and role as a continuous nemesis that viewers could become familiar with.

Every main character of the series was designed using the geometric shapes of Tex Avery's Looney Tunes graphic style in mind—Doofenshmirtz appears to be an oval.

[9] In 2009, Josh Jackson, editor-in-chief for Paste magazine, wrote in a blog that Phineas and Ferb was "the best kids show on TV" and gave Doofenshmirtz a large amount of praise.

Jackson calls his inventions "awesomely designated devices of pure evil" and his complex relationship with his nemesis Perry the Platypus as "pitch-perfect.

"[22] Despite a negative review of Phineas and Ferb on Toon Zone, Maxie Zeus notes that Povenmire's performance as Doofenshmirtz is a strong point of the series.

Zeus writes, "Dan Povenmire voices him with such energy, and with such perfect timing, that you'll laugh out loud even at the stuff that isn't even supposed to be funny."