Yale University is an American private Ivy League research university in New Haven, Connecticut. Founded in 1701, it is the third-oldest institution of higher education in the United States and one of the nine Colonial Colleges chartered before the American Revolution.
Prof Santos has more insight than most into how happy people are.
"It went viral," laughs Prof Santos, who has now made.Prof Laurie Santos (far right) led a panel on happiness at The World Economic Forum
But it's not just students that aren't happy.
At The World Economic Forum in Davos, amid all the high-powered meetings, networking and speeches, there's barely enough time for lunch.
Yet when I make the long journey via coach and ski lift to the very top of the mountain, which is known as the Rinerhorn Base Camp, for a three-hour workshop on "discovering happiness", I'm accompanied by a European Royal Family member and several chief executives from large multinational companies.
Some of the people in The Room earn hundreds of thousands of pounds each year, but still want to feel happier.Three steps to happiness
It's an uncomfortable exercise.
Yet it provides three things that are meant to improve happiness:
Research shows that while genetics plays a large part, accounting for half our happiness, what we do each day accounts for 40%, with just 10% down to Our Life circumstances.
She thinks a big problem is that we often don't understand what being happy means. She says it is a specific emotion, usually in reaction to something, and comes and goes.
A general sense of wellbeing is a more realistic aim, she says.You don't need to smile all the time, says Emiliana Simon-Thomas (though she did smile for this picture)
That means it's OK to feel negative emotions, such as sadness or anger, but that we should have enough resilience to bounce back.
"Many of us think we need to be enthusiastic and smiling all the time. We don't have that kind of life. Things happen," she says.
But how do we know if we're happy?
Mrs Simon-Thomas says most measurements are based on self-assessment but appear to be broadly accurate.
"It's not a perfect science, but I do kind of know if I Am ," she says.
Such measurements are being seen as increasingly important.
New Zealand recently announced that its 2019 budget would report on.
The science also shows that wellbeing is something companies should care about, because of its impact on improving productivity.Tsoknyi Rinpoche advises taking a break from texting and constantly checking emails
He describes it as rediscovering the "spark" You had as a child, and advocates regular meditation.
Being in the moment, not texting or checking emails or thinking about other things, will bring You a sense of contentment over time, he says.
He asks us to breathe out sharply And Then close our eyes and relax.
For me it doesn't work at all. My mind is jumping and I'm thinking about other things. Other attendees say the same.
As we head back down the mountain, scrolling through our emails, it is clear it's going to take More Than one workshop to change our mindsets.
But the more we practise, the happier we are likely to feel, says Prof Santos.
And she is an inspiring example. Ironically, for someone who has been dubbed the "professor of happiness", she describes herself as a naturally "morose person".
"But I have to practise what I preach. I've gone up a whole point on the measurement of happiness scale in the year I've been teaching The Class ," she says.