Comma after job title and before name [closed]

Solution 1:

In these kinds of sentences the comma is used to indicate supplemental information - in other words information that is not necessary to understand the sentence, but adds to it.

If the information is not supplemental, but necessary, you don't put a comma.

For example:

This reminds me of the work of the President of the United States, Donald Trump.

"Donald Trump" is supplemental information because "President of the United States" completely identifies the person. But

This reminds me of the work of former President of the United States George W Bush.

"George Bush" is not supplemental because it is necessary to distinguish which of the former presidents is being talked about.

Likewise if you only have one sister you write:

This reminds me of the work of my sister, Karen.

But if you have several sisters you write:

This reminds me of the work of my sister Karen.

In your example "architect" is not sufficient to identify the person, so the name is not supplemental. The first sentence is the correct one. (The third is completely wrong.)

Incidentally you could write:

This reminded me of the work of Leon Krier, architect.

because "Leon Krier" completely identifies the person and "architect" is supplemental information.