He was an invited plenary speaker at the International Congress of Mathematicians in Moscow, 1966.

The Annual Meeting is currently a four-day conference, with a program of talks, plenary speakers, symposia, and poster sessions for researchers to share their work.

A partial list of plenary and invited speakers include:

A frequent plenary and invited speaker at major international optics conferences, Payne has published over 600 conference and Journal papers.

The event features 40-60 workshop and a slate of plenary speakers.

He was a plenary speaker at the 2010 International Congress of Mathematicians.

In 2002 he was plenary speaker at the ICM Beijing.

The Society also subsidizes lunches with the plenary speakers.

He was a plenary speaker at the 1998 International Congress of Mathematicians in Berlin.

She was a plenary speaker at the Urbana Missions Convention three times.