Sentence:  The feel-good trade's blizzard of lighter-than-air tracts proves nothing whatever about happiness except that a lot of people are willing to pay for help in pursuing it. The new <WSD>happyologists</WSD> are doing a bit better than that, though their young science is now approximately where navigation was before the invention of the compass. 
Meaning of the word marked with <WSD> tags:  One who helps people become happier.