“As artistic neighbors go, Howard Shalwitz and Michael Kahn appear to be miles apart. Shalwitz runs the new-plays troupe Woolly Mammoth Theatre; Kahn heads the classical Shakespeare Theatre Company. Woolly seats 265; the STC’s two stages combined hold more than 1,200. … Swinging up and down Seventh Street between the Lansburgh and Woolly from morning till night, these are glimpses of a day in the life as Shalwitz and Kahn gear up for their latest shows and power down their leadership roles.”