FOUR CHINESE SCHOLARS - Artist signature

This is the signature of the artist of the oil painting FOUR CHINESE SCHOLARS. It is not clear what the signature is - N H Chau? N H Chim? W N Chen?

Does anyone have any idea who the artist might be? To be this expert he (or she) must have done many other similar works.

Please refer to previous post about the painting for details.

Suziepie