Force data for a flapping foil energy harvester with active leading edge motion operating in the low reduced frequency range is collected to determine how leading edge motion affects energy harvesting performance. The foil pivots about the midchord and operates in the low reduced frequency range of 0.06, 0.08, and 0.10 with Re of 20,000 − 30,000, with a pitching amplitude of 70 degrees, and a heaving amplitude of 0.5𝑐. It is found that leading edge motions that reduce the effective angle of attack early the stroke work to both increase the lift forces as well as shift the peak lift force later in the flapping stroke. Leading edge motions in which the effective angle of attack is increased early in the stroke show decreased performance. In addition a discrete vortex model with vortex shedding at the leading edge is implement for the motions studied; it is found that the mechanism for shedding at the leading edge is not adequate for this parameter range and the model consistently over predicts the aerodynamic forces.