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The 20-year-old, who joined the club from Dundee United last summer, followed up his decisive effort at Queen's Park on Saturday with another against Stenhousemuir on Tuesday evening.
His sweet strike with 14 minutes to go ended the high-flying Warriors' unbeaten home record this season, and extended Athletic's unbeaten run to nine matches.
Rory Macleod scored Athletic's winner for a second successive match on Tuesday night. (Image: Craig Brown.)
Macleod's third goal of the campaign also took Dunfermline into the Premiership play-off places, and to within three points of league leaders, Partick Thistle.
His efforts have delighted Lennon, who said he hoped that the player going off, having felt his groin, in the closing stages would be "nothing too serious".
"I mean, we should've scored from one of his crosses first half. He was always a threat," Lennon said.
"The keeper made a great save second half, and then he made a double save from Andy (Tod), and then Keith (Bray).
"You're thinking, just keep going, and, when it fell to him, it's either going over the bar or, he's going to hit it well.
"Thankfully, he controlled it beautifully, and hit it really hard.
"He's making a massive contribution now. That's two match winners and he's playing very, very well."