May an H-1B be paid by more than one employer (also known as concurrent employment)?
Since H-1B is employer specific; you may only work for the employer who filed the H-1B petition and can only perform the job indicated in the petition. Concurrent employment is possible, but each employer must have filed an H-1B petition on your behalf. You should speak with an ISSS scholar advisor before you commence concurrent employment. Working without legal authorization for any employment is a violation of your H-1B status. So a timely discussion with an ISSS scholar advisor will provide you the necessary advice to safely commence concurrent employment.