Mok has served as the art and costume director for countless films and TV dramas and has received multiple nominations at the Hong Kong Film Awards for Art Direction, Costume and Makeup Design. His nominated works include designs for My Heart is That Eternal Rose, Kawashima Yoshiko, Eighteen Springs etc. He captured the Best Art Direction at the Asia Pacific Film Festival for Kawashima Yoshiko in 1990, and the Best Costume and Makeup Design at Taiwan's 34th Golden Horse Awards.

He participated in the stage drama Zheng He and the Emperor and won the Best Costume Design at the 15th Hong Kong Drama Awards. He received 2012 Hong Kong Dance Award for Outstanding Design for Dance which is presented to the whole design team on Two Swallows - Ode to Wu Guanzhong.

曾任多齣電影、電視劇美術及服裝指導，作品見於中、港、美。多次獲提名香港電影金像獎，提名作品有《殺手蝴蝶夢》（美術）、《川島芳子》（美術）、《半生緣》（服裝指導）等。於1990年憑《川島芳子》獲亞太影展「最佳美術指導」，1997年憑《半生緣》獲第三十四屆金馬獎「最佳造型設計」。近年來，他主要為舞台演出擔任服裝造型及道具設計。2005年憑舞台劇《鄭和與成祖》獲第十五屆香港舞台劇獎「最佳服裝設計」。2012年憑《雙燕-吳冠中名畫隨想》獲2012香港舞蹈年獎「最値得表揚舞美」。