I thought there were several, but nope.
Wm. Howard Taft was the only person to serve as a US President and later served as a Justice.
Around that same time, the leftists, including the vile William Jennings Bryan, a CINO, were setting up a trajectory for the 'RAT Woodrow Wilson to eventually ascend to the SCOTUS. But we he went even more cuckoo than he already was, that plan was scuttled.