What am I? Guess what I am/do from the descriptions.

I seek to promote the welfare of others especially by donating generously to various organisations and good causes.

I'm a doctor who specialises in treating diseases of the heart and blood vessels.  

I'm a person who studies the history and origin of words.

I'm someone who is qualified to diagnose and treat skin disorders.

I have studied birds for a long time and I'm now an expert on the subject of birds.

I have a passion for and great skill in combining different elixirs to create extraordinary cocktails.

I use graphs and computer equipment to study and collect information about earthquakes and their results, such as tsunamis and landslides.

I have always loved looking at the stars. I now study the origin and nature of the universe by looking at the stars through my big telescope. 

I study the differences and similarities between different peoples and their cultures.

I love identifying precious stones. I'm in the science of studying, cutting and valuing natural and artificial precious and semi-precious stones.