Ranganathan holds a bachelor degree in commerce(Madras University),a chartered accountant and a company secretary by qualification.

Has a total experience of over four decades in public sector, private-corporate sector and in consultancy.

Started the career in General Insurance Corporation.

Had worked in a premier group based in Chennai in different capacities and was General Manager (Group taxation) . Handled complex assignmentsboth for the corporate group and for the promoter family

Worked in consultancy for over two decades and was with Ernst&Young. Had led and executed critical assignments across industries and sectors and had conceptualised and carried out complex corporate reorganisation under the companies Act and Sick Industrial companies Act.

Had a special focus on entrepreneur led companies and advised the promoters on various sensitive governance issues.

Had worked on key foreign inward investment driven projects.

Presently, an independent director infour public companies and serve as audit committee chair in two of them.

Chair of the audit committee of a  not-for -profit with Government of India as key partner

Has an advisory role with a PE firm and a private boutique corporate consultancy firm.

Was a visiting faculty for over two decades in the Indian Institute of Management, Ahmedabadon the subject of corporate restructuring, mergers and acquisitions.

Was very actively involved with the Madras Chamber of Commerce for over 35years and with CII and FICCI as well, serving on various committees at different points in time.

Has addressed and chaired sessions on taxation, corporate law, accounting and governance related subjects in various professional conferences at all India level organisations

Writes on subjects of the economy, fiscal management and corporate governance in Hindu Business Line, Moneylife.in, Industrial Economistetc.,

Has an active blog in Substack.com with many current writings.