Magnetic fields are believed to play a crucial role in the star
formation process. Observations of polarized dust emission from active
star forming regions can be used to map the magnetic field. The
Submillimeter Array (SMA) was used to obtain maps of the magnetic
field in a number of Class 0 and Class I young stellar objects. I
will be presenting and discussing some of these results. These
observations by the SMA have been successful at providing new 
evidence that show that the effects of magnetic field are important in
these objects.

I will also provide an introduction to the Submillimeter Array and
show examples of some of the exciting results that have been achieved
from recent observations.