Depending on the case you could use e.g. : Created by Prepared by Crafted by etc.

In IT Developed by, Wrote by ...

He/she has given the preposition 'by' so you could not confuse it with 'made in'.

The answer depends on the context. Can you explain a bit more about how you are using the term? In which situation? Sometimes one might say "Made in USA... or Made in China" when referring to a product created in a country. However if you were reading a newspaper article the word "made" would not be used. In that case (or the case of writing a paper) one might simple write "by YiChen Du" or even "YiChen Du" by itself. If you can give more context then I can present an appropriate response.