The best Quotations

Do you know the writers of the following quotations?

Quotation An associate producer is the only guy in Hollywood who will associate with a producer. - writer
Quotation Smile, it's free therapy. - writer
Quotation The distinctive character of a child is to always live in the tangible present. - writer
Quotation The screech and mechanical uproar of the big city turns the citified head, fills citified ears - as the song of birds, wind in the trees, animal cries, or as the voices and songs of his loved ones once filled his heart. He is sidewalk-happy. - writer
Quotation Persecution is a tribute the great must always pay for preeminence. - writer
Quotation Virtuous and vicious everyone must be; few in extremes, but all in degree. - writer