William Albert Muggia is listed as Chief Executive Officer And Chief Investment Officer at Westfield Capital Management Company, L.P. on SEC Form ADV.
Form ADV reports a beneficial ownership band of Under 5%.
| Title | Chief Executive Officer And Chief Investment Officer |
| Ownership | Under 5% |
| Control person | Yes |
| Since | 2001 |
| Title | Member Of Management Committee |
| Ownership | 50-75% |
| Control person | Yes |
| Since | 2008 |