Carl P. Munck was an archaeocryptographer, which is science of decoding monuments such as the pyramids, Stonehenge and so on. This began as a hobby. He was a cryptographer. His "credentials" rest with his mathematical discoveries regarding megalithic monuments , which become self-evident , after he discovered them and published his findings .
Invalid credentials means that one does not have the right to access something. You most likely do not have the correct user name and/or password.
Carl von Linnaeus
Carl Friedrich Wenzel died in 1793.
Carl Joachim Friedrich died in 1984.
Probably not without a great GPA and excellent credentials.
Noah Munck's birth name is Noah Bryant Munck.
Carl P. Wright was born in 1893.
Carl A. P. Ruck was born in 1935.
Johan Munck was born in 1943.
Sverre Munck died in 1970.
Sverre Munck was born in 1898.
Noah Bryant Munck
Carl P. Morton has written: 'Desiring stone'
Carl P. Daw Jr. was born in 1944.
To make the question more specific the full first name is mentioned, i.e. Petronella instead of P
Guppy Gibson is portrayed by Ethan Munck, and is the real life brother of Noah Munck (Gibby)
Gibby is played by Noah Munck and Guppy is played by Ethan Munck.