Her new role will see her focus on driving business growth and providing successful customer offerings.
Blight-Johnston was previously RGA Reinsurance Company's managing director, leading the company's Australian and New Zealand business, with additional leadership responsibilities in Japan and South Africa.
She has also held roles at Asteron Life, as a chief financial officer and appointed actuary, and at Tillinghast-Towers Perrin as a senior actuarial consultant.
Blight-Johnston will take over from AMP's current director of wealth protection and mature products, Ian Campbell.