C. Parker, an American jazz arranger active during the mid-20th century, was a significant figure in the development of big band and orchestral jazz. Known for his sophisticated harmonic voicings and intricate counterpoint, Parker's arrangements often blended swing era traditions with emerging bebop sensibilities. He notably collaborated with prominent bandleaders like Duke Ellington and Count Basie, contributing charts that showcased his innovative approach to ensemble writing. His work helped shape the sound of large jazz ensembles, influencing generations of arrangers with his distinctive blend of complexity and swing.