A Bachelor of Laws Degree holder from University of Malaya in 1981, YBhg Tan Sri Rozali began his career as Legal Advisor with the Urban Development Authority (UDA) before joining Bank Islam (M) Berhad in 1983. Together with a few pioneer bank staff, he conceptualised the first institution of Islamic banking in Malaysia. Subsequently, in 1987, he started his own legal practice as an Advocate and Solicitor for seven years, specialising in corporate, property and banking works.

In 1989, YBhg Tan Sri Rozali set up a family-owned company and embarked into the property development sector, with involvement in several development projects in the Klang Valley, Kuantan and Johor. Under the banner of Puncak Alam Housing Sdn Bhd, he developed a new township known as Bandar Baru Puncak Alam. The family-owned company also ventured into the utility business in 1989 with the setting up of PNSB. Due to his vast experience in various fields, he was entrusted by the Selangor State Government, via PNSB, to manage the water treatment plants for the whole of the State of Selangor Darul Ehsan and the Federal Territory of Kuala Lumpur. PNHB was subsequently incorporated in January 1997 as the holding company of PNSB and was listed on the Main Board of Bursa Malaysia Securities Berhad (effective 3 August 2009 known as Main Market of Bursa Malaysia Securities Berhad) on 8 July 1997.

YBhg Tan Sri Rozali is the major shareholder of one (1) listed company, namely, TRIplc Berhad, a property company.