Who composed the song “Grow Till Tall” by Jonsi?

The song “Grow Till Tall” by Jonsi was composed by Jónsi.

Grow Till Tall

Jónsi

You'll know, when's time to go on
You'll really want to grow and grow till tall
They all, in the end, will follow

Grow till tall, they all, in the end, will follow
They in the end, will soon fold

You'll know, you'll go
You'll know, you'll know
You'll know
You'll know, you'll know

You'll... know
You'll... know
You'll... know
You'll... know
You'll... know
You'll... know
You'll... know
You'll... know
You'll... know
You'll... know