Gajanan Digambar Madgulkar was a famous marathi poet, lyricist, writer and actor. He is popularly known as GaDiMa (गदिमा). G D Madgulkar was called Adhunik Valmiki of current era. Geet Ramayan was his most notable work.
GaDiMa wrote for marathi as well as hindi movie lyrics, dialogues and script.
Reference from Wikipedia!