We would like to thank Paul Adler, Tom Bateman, Dan Brass, Nosh Contractor, Adelaide King,

for thoughtful comments on this manuscript. 2 We argue that individual performance in knowledge intensive work is associated with properties of both networks and ties. Networks can yield benefit via awareness of and access to non-redundant information. Ties such as relationships crossing organizational boundaries, physical barriers and hierarchical levels, also provide opportunities to gather unique information and consider diverse perspectives when completing tasks at work. Egocentric and bounded network data from 101 engineers within a petrochemical company and 125 consultants within a strategy-consulting firm support our contention that both networks and ties are related to individual performance in knowledge intensive work