Question: What type of design was the designer who, together with Robert Slimbach, designed the Myriad typeface best known for?

Context paragraphs:
FF Scala: FF Scala is an old-style serif typeface designed by Dutch typeface designer Martin Majoor in 1990 for the Muziekcentrum Vredenburg in Utrecht, the Netherlands.  The FF Scala font family was named for the Teatro alla Scala (1776–78) in Milan, Italy.  Like many contemporary Dutch serif faces, FF Scala is not an academic revival of a single historic typeface but shows influences of several historic models.  Similarities can be seen with William Addison Dwiggins' 1935 design for the typeface Electra in its clarity of form, and rhythmic, highly calligraphic italics.  Eric Gill's 1931 typeface Joanna (released by Monotype Corporation in 1937), with its old style armature but nearly square serifs, is also similar in its nearly mono-weighted stroke width.

Minion (typeface): Minion is a serif typeface designed by Robert Slimbach in 1990 for Adobe Systems and inspired by late Renaissance-era type.  The name comes from the traditional naming system for type sizes, in which minion is between nonpareil and brevier, with the type body 7pt in height.  As the name suggests, it is particularly intended as a font for body text in a classical style, neutral and practical while also slightly condensed to save space.  Slimbach described the design as having "a simplified structure and moderate proportions."

Warnock (typeface): Warnock is an old style typeface commissioned by Chris Warnock in honor of his father, John Warnock, in 1997.  It was designed by Robert Slimbach and first published in 2000 as Warnock Pro.

Carol Twombly: Carol Twombly (born 1959) is an American designer, best known for her type design.  She worked as a type designer at Adobe Systems from 1988 through 1999, during which time she designed, or contributed to the design of, many typefaces, including Trajan, Myriad and Adobe Caslon.

Myriad (typeface): Myriad is a humanist sans-serif typeface designed by Robert Slimbach and Carol Twombly for Adobe Systems.  Myriad was intended as a neutral, general-purpose typeface that could fulfil a range of uses and have a form easily expandable by computer-aided design to a large range of weights and widths.

Robert Slimbach: Robert Joseph Slimbach is Principal Type Designer at Adobe Systems, where he has worked since 1987.  He has won many awards for his digital typeface designs, including the rarely awarded Prix Charles Peignot from the Association Typographique Internationale, the SoTA Typography Award, and repeated TDC awards from the Type Directors Club.  His typefaces are among the most commonly used in books.

Arno (typeface): Arno is a serif type family created by Robert Slimbach at Adobe intended for professional use.  The name refers to the river that runs through Florence, a centre of the Italian Renaissance.  Arno is an old-style serif font, drawing inspiration from a variety of 15th and 16th century typefaces.  Slimbach has described the design as a combination of the period's Aldine and Venetian styles, with italics inspired by the calligraphy and printing of Ludovico degli Arrighi.

Adobe Jenson: Adobe Jenson is an old-style serif typeface drawn for Adobe Systems by its chief type designer Robert Slimbach.  Its Roman styles are based on a text face cut by Nicolas Jenson in Venice around 1470, and its italics are based on those created by Ludovico Vicentino degli Arrighi fifty years later.

Poetica (typeface): Poetica is the name of a calligraphic, ornamental typeface designed by Robert Slimbach for Adobe Systems in 1992.  As one of the first of the Adobe Originals family of typefaces, it attained a wide usage in digital typography.

Utopia (typeface): Utopia is the name of a transitional serif typeface designed by Robert Slimbach and released by Adobe Systems in 1989.

Supporting paragraphs: Carol Twombly Myriad (typeface)
Answer: type design