Aktiv Grotesk from Dalton Maag
Yours truly, writing for Typekit:
Designed as an alternative to Helvetica – Bruno Maag’s attempt to strike a balance between Helvetica and Univers – Aktiv Grotesk works in much the same way that these classic rationalist sans serif faces do: it is best used for headings and short copy at mid-to-large sizes. Aktiv Grotesk is available in seven weights ranging from Hairline to Black, with italics.