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In page Lawrence Roberts (scientist):

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Roberts' plan for the ARPANET was the first wide area packet-switching network with distributed control. ARPA issued a request for quotation (RFQ) to build the system, which was awarded to Bolt, Beranek and Newman (BBN). Significant aspects of the networks's operation including routing, flow control, software design and network control were developed by the BBN IMP team.[9] Roberts managed its implementation and contracted with Leonard Kleinrock in 1968 to carry out mathematical modelling of the network.[10] When Robert Taylor was sent to Vietnam in 1969 and then resigned, Roberts became director of the IPTO.