Weissglass' business firm, Weissglass-Almagor, invests heavily in both Israeli and Palestinian industry.
He has attracted criticism from the Israeli Left for many of his statements. In 2004 he remarked "The disengagement [strategy with Palestinian government] is actually formaldehyde. It supplies the amount of formaldehyde that's necessary so that there will not be a political process with the Palestinians."
In reference to the Gaza blockade he is said to have remarked "we have put them [i.e. Gazans] on a diet."