Miller joins Emap from Lexis Nexis where she was head of conferences and training, delivering more than 450 events a year.
Prior to Lexis Nexis, Miller was executive conference manager at Emap for four years when she headed up more than 50% of the then portfolio.
Miller will be responsible for leading the conference business to its next phase and working with customers, the editors and brand teams to further develop the revenue stream.
She will join Emap in April 2013, and will be based at Telephone House, the publisher's new central London offices.
Emap currently runs more than 150 live events a year in construction and engineering, health, local government and retail, including the HSJ Summit and Retail Live.
The HSJ Summit each year gathers professionals from across the private and public healthcare communities and provides a forum for open debate and discussion around key challenges faced by key figures in the NHS and private healthcare.
Retail Week Live, 13-14 March 2013, meanwhile, attracts more than 800 CEOs and senior retail sector delegates.
Tracey Davies, MD, retail and live events, said: "Fiona is joining at an exciting time for EMAP and our conferences division in particular. Emap attracted additional subscribers to our products, increased sponsorship from partner companies and more delegates than ever to our events last year. Overall, the business turned around, delivering revenue growth over 2011, while still launching new products and investing significantly in the business. Fiona will also explore innovative ways to serve our customers and ensure our valuable content stays ahead of the market."