My personality type has changed little over the years.  Every so often, I take the myers briggs test again to see what my letters were and I go, "oh yeah, that was it" when I see them.

http://kiersey.com describes my personality like this:

Providers take it upon themselves to insure the health and welfare of those in their care, but they are also the most sociable of all the Guardians, and thus are the great nurturers of social institutions such as schools, churches, social clubs, and civic groups. Providers are very likely more than ten percent of the population, and this is fortunate for the rest of us, because friendly social service is a key to their nature. Wherever they go, Providers happily give their time and energy to make sure that the needs of others are met, and that social functions are a success.

Highly cooperative themselves, Providers are skilled in maintaining teamwork among their helpers, and are also tireless in their attention to the details of furnishing goods and services. They make excellent chairpersons in charge of dances, banquets, class reunions, charity fund-raisers, and the like. They are without peer as masters of ceremonies, able to speak publicly with ease and confidence. And they are outstanding hosts or hostesses, knowing everyone by name, and seemingly aware of what everyone's been doing. Providers love to entertain, and are always concerned about the needs of their guests, wanting to make sure that all are involved and provided for.

http://typelogic.com describes the ESFJ like this:

Guardians of birthdays, holidays and celebrations, ESFJs are generous entertainers. They enjoy and joyfully observe traditions and are liberal in giving, especially where custom prescribes.

All else being equal, ESFJs enjoy being in charge. They see problems clearly and delegate easily, work hard and play with zest. ESFJs, as do most SJs, bear strong allegiance to rights of seniority. They willingly provide service (which embodies life's meaning) and expect the same from others.

ESFJs are easily wounded. And when wounded, their emotions will not be contained. They by nature "wear their hearts on their sleeves," often exuding warmth and bonhomie, but not infrequently boiling over with the vexation of their souls. Some ESFJs channel these vibrant emotions into moving dramatic performances on stage and screen.

Strong, contradictory forces consume the ESFJ. Their sense of right and wrong wrestles with an overwhelming rescuing, 'mothering' drive. This sometimes results in swift, immediate action taken upon a transgressor, followed by stern reprimand; ultimately, however, the prodigal is wrested from the gallows of their folly, just as the noose tightens and all hope is lost, by the very executioner!

An ESFJ at odds with self is a remarkable sight. When a decision must be made, especially one involving the risk of conflict (abhorrent to ESFJs), there ensues an in-house wrestling match between the aforementioned black-and-white Values and the Nemesis of Discord. The contender pits self against self, once firmly deciding with the Right, then switching to Prudence to forestall hostilities, countered by unswerving Values, ad exhaustium, winner take all.

As caretakers, ESFJs sense danger all around--germs within, the elements without, unscrupulous malefactors, insidious character flaws. The world is a dangerous place, not to be trusted. Not that the ESFJ is paranoid; 'hyper-vigilant' would be more precise. And thus they serve excellently as protectors, outstanding in fields such as medical care and elementary education.