The answer you seek is: Sir Alexander Fleming.

Penicillin wasn't invented but discovered in 1928 when Scottish chemist ALEXANDER FLEMING observed that mould forming on bread could destroy certain bacteria.

Penicillin is invented accidentally by Alexander fleming.He saw that when a fungi  'penicillin notatum' grown in a microbial plate,the 'penicillin notatum' inhibited the growth of microbial

Alexander Flemming invented penicillin from a type of fungus "PENICILLIUM"

Alexander fleming

Alexander Flemming  

Invented The Penicillin

check out this link to find more info
en.wikipedia.org

Alexander flemming

Alexander flemming.

Penicillin G was invented by Penicillinium notatum, a fungus. Many other penicillin were invented by bacteria, such as Chromobacterium violaceum and  some species belonging to actinomycaetales.
Microorganisms are thought to have evolved the ability to synthesize antibiotics to provide a "selective advantage" in the biological niche that they grow in, predominantly in the soil. In order to prevent committing bacterial "suicide", these organisms must have evolved, at the same time, mechanisms to prevent themselves from being killed. Many resistance genes can be
found in the organisms that produce antibiotics, and these genes can be transferred to other antibiotic-sensitive organisms, generating resistance. This is also part of the answer of the question of antibiotic resistance origins.

Alexandra fleming she invented it by accident with a fungus called some think but i have forgoten what its called woops

Alexander fleming by an accidental coincidence

Sir Alexander Fleming

Sir Alexander Fleming - a Scottish scientist

Alexander fleming

Salvey