English and Math tutor to advance level

I am a researcher and educator for multiple topics fully in English. However, I spend my time doing research on sustainable development when I am free.
Let me know if your need can be fulfilled by my expertise. I am not a native but whole of my life is spend on English as main language until up to PhD research that I complected 2 years back.
Thanking you in advance
Sincerely
Hari