Anyone who is interested in writing a play and afraid of writing, can write it in an online workshop.

I highly recommend Mamet for playwriting. I know Mamet for years, you can see his passion for playwriting through everything he does. He is gifted and he has sharpened his skills over years and now he is tutoring which means his skills are available to others to learn from.
He is a patient teacher with a good sense of humour which put you on ease. I found him always happy to go the extra mile to make sure the job is properly executed in the best possible quality.