who is the father of medicine and why?

Hippocrates, he used essential oils to rid Athens of plague and wrote
about using plants, such as frankincense, myrrh, roses, and opium for
medical purposes

who were regarded as the pioneers of aromatherapy and why

The Egyptians as they had vast knowledge of plants and used oils for
cosmetic , religious and medical purposes and to embalm the dead.

what knowledge did the Greeks have regarding aromatherapy

discovered that odour of certain flowers were either relaxing or
stimulating, they used olive oil to absorb odour from flower petals
and used this perfumed oil in both cosmetic and medicinal reasons.
soldiers when going into battle, would take ointments with them
containing myrrh for treating wounds

what knowledge did the romans have?

many doctors were Greek who share their knowledge with the romans.
they used oils not only of medicinal purposes but also to beautify
themselves. as in perfume.

The middle east, what happen here regarding aromatherapy

An Arab physician called Avicenna( ( ad980-1037) wrote books on the
subject of plants and their effects on the body. he is also thought to
have invented the first distillation method for extracting aromatic
oils from plants, rose being the first

Medieval times

The plague regularly swept Europe with devastating consequences,
bonfires of aromatic woods would be lit to purify the air, doctors
often wore nose bags of aromatic herbs to kill germs. such as cinnamon
and cloves

who was a chemist, and by accident found out that lavender was found
to heal and prevent scarring?

Rene-Maurice Gattefosse

Rene-Maurice Gattefosse, did what regarding aromatherapy in 1928

wrote his first book called Aromatherapie the first time this term
had been used

who during the 1940's and 50's was a surgeon in the army and had used
essential oils to treat injured soldiers in the second world war and
later used oils to help mentally disturbed patients in psychiatric
hospitals, and also published "the practice of Aromatherapy"
in 1964

Dr Jean Valnet

who brought aromatherapy to England, and incorporated the use of oils
with massage.

Madame Marguerite Maury