Seal assemblies with a seal body having an inside flange and an outside flange that are biased outwardly away from one another by a spring energizer, such as a canted coil spring or a V-spring. The seal assemblies further include EMI shielding by incorporating at least one spring energizer that provides at least part of a conductive path between a housing and a pin. The conductive path can alternatively be provided by two different spring energizers and optionally with a conductive strip or trace or via a conductive contact ring element. The present seal assemblies are usable in applications having the needle for both sealing and EMI shielding.