There really is no 'author of euthanasia.' However, there are lots of people famously involved in euthanasia- an example would be Jack Kevorkian. If you are talking about books, some authors of euthanasia-topics would be Michael Manning, Jonathan Moreno, or Carrie Snyder. Hope I was of help!
Virginia Noir has written: 'Euthanasia' -- subject(s): Bibliography, Euthanasia
Carolyn S. Roberts has written: 'Euthanasia' -- subject(s): Euthanasia
George Lothum has written: 'Euthanasia'
Ian Robert Dowbiggin has written: 'Inheriting madness' 'A concise history of euthanasia' -- subject(s): Euthanasia
James Gay Williams is a philosopher and ethicist known for his work on bioethics and medical ethics. He is the author of the book "The Wrongfulness of Euthanasia" where he argues against the practice of euthanasia.
Mary Alice Tordella has written: 'An instrument to appraise attitude of college students toward euthanasia' -- subject(s): Attitudes, College students, Euthanasia, Psychological aspects, Psychological aspects of Euthanasia, Testing
Antoinette Chanu has written: 'Euthanasie' -- subject(s): Euthanasia, Law and legislation, Moral and ethical aspects, Moral and ethical aspects of Euthanasia
Diane Foster has written: 'Should voluntary euthanasia be legalised?'
Manuel Cuyas has written: 'Eutanasia' -- subject(s): Euthanasia
Heike Knops has written: 'Die Verantwortung der Kirche in der Euthanasie-Frage' -- subject(s): Christianity, Deutsche Evangelische Kirche, Doctrines, Euthanasia, Evangelische Kirche in Deutschland, History, Moral and ethical aspects of Euthanasia, Religious aspects of Euthanasia
George Arthur Tattrie has written: 'Euthanasia' -- subject(s): Euthanasia, Moral and ethical aspects, Moral and ethical aspects of Euthanasia, Moral and ethical aspects of Right to die, Right to die 'Jonathan Edwards' understanding of the natural world and man's relationship to it'
No, euthanasia is illegal in Greece.