For summons, I am uncertain.
For a called creature, no.
For the Orbs, he's immune (probably), as you'd have to target him.
To clarify the difference between called creatures, wall of iron, and orb spells, the former two are instantaneous conjurations that neither target him, nor do they have an area that includes him, whereas the latter, although instantaneous conjurations, must be targeted on him.
I'll try and generalize my intent:
In general, if a spell is either targeted upon or has an area that includes him in such a way that the spell directly affects him, ie fireball, evard's black tentacles, he is unaffected, however, a spell that has an effect that affects something else, causing that something else to affect him in some way, he is affected as normal, ie Transmute Rock to Mud (as TRtM affects the rock, turning it to mud, which then affects him).
Still not that clear, but better (I hope).
For a called creature, no.
For the Orbs, he's immune (probably), as you'd have to target him.
To clarify the difference between called creatures, wall of iron, and orb spells, the former two are instantaneous conjurations that neither target him, nor do they have an area that includes him, whereas the latter, although instantaneous conjurations, must be targeted on him.
I'll try and generalize my intent:
In general, if a spell is either targeted upon or has an area that includes him in such a way that the spell directly affects him, ie fireball, evard's black tentacles, he is unaffected, however, a spell that has an effect that affects something else, causing that something else to affect him in some way, he is affected as normal, ie Transmute Rock to Mud (as TRtM affects the rock, turning it to mud, which then affects him).
Still not that clear, but better (I hope).