He passed from Westminster School to Christ Church, Oxford, and King's College, University of Aberdeen, and was finally entered as a student of law at Lincoln's Inn, London. While in Aberdeen he published a poem satirizing Charles James Fox, called The Man of the People; and in 1782 he produced, at his father's playhouse in the Haymarket, his first play, The Female Dramatist, for which Smollett's Roderick Random supplied the materials. It was unanimously condemned, but Two to One (1784) was entirely successful. It was followed by Turk and no Turk (1785), a musical comedy; Inkle and Yarico (1787), an opera; Ways and Means (1788); The Iron Chest (1796), taken from William Godwin's Adventures of Caleb Williams; The Poor Gentleman (1802); John Bull, or an Englishman's Fireside (1803), his most successful piece; The Heir at Law (1808), which enriched the stage with one immortal character, "Dr Pangloss," and numerous other pieces, many of them adapted from the French.
The failing health of the elder Colman obliged him to relinquish the management of the Haymarket theatre in 1789, when the younger George succeeded him, at a yearly salary of £600. On the death of the father the patent was continued to the son; but difficulties arose in his way, he was involved in litigation with Thomas Harris, and was unable to pay the expenses of the performances at the Haymarket. He was forced to take sanctuary within the Rules of the King's Bench. Here he resided for many years continuing to direct the affairs of his theatre. Released at last through the kindness of George IV, who had appointed him exon. of the Yeomen of the Guard, a dignity disposed of by Colman to the highest bidder, he was made examiner of plays by the duke of Montrose, then lord chamberlain. This office, to the disgust of all contemporary dramatists, to whose manuscripts he was as illiberal as he was severe, he held till his death. Although his own productions were open to charges of indecency and profanity, he was so severe a censor of others that he would not pass even such words as "heaven," "providence" or "angel." His comedies are a curious mixture of genuine comic force and sentimentality. A collection of them was published (1827) in Paris, with a life of the author, by JW Lake.
Colman, whose witty conversation made him a favourite, was also the author of a great deal of so-called humorous poetry (mostly coarse, though much of it was popular)--My Night Gown and Slippers (1797), reprinted under the name of Broad Grins, in 1802; and Poetical Vagaries (1812). Some of his writings were published under the assumed name of Arthur Griffinhood of Turnham Green. He died in Brompton, London. He had, as early as 1784, contracted a runaway marriage with an actress, Clara Morris, to whose brother David Morris, he eventually disposed of his share in the Haymarket theatre. Many of the leading parts in his plays were written especially for Mrs Gibbs (née Logan), whom he was said to have secretly married after the death of his first wife.
See the second George Colman's memoirs of his early life, entitled Random Records (1830), and RB Peake, Memoirs of the Colman Family (1842).