Maison Neue with Univers in action on oudolf.com

Under the hood

.header-1 { font-family: 'Maison Neue Book', Helvetica, Arial, sans-serif, sans-serif; font-size: 61px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 75px; text-transform: none; color: #FFFFFF; }
.header-2 { font-family: UniversLTStd-Light; font-size: 15px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 28px; text-transform: none; color: #808080; }

Univers is available from Fonts.com and MyFonts.