Why are PDF in pdfinfo keywods run together

Question

My document includes the commands

\documentclass{article}
\usepackage [colorlinks] {hyperref}
\hypersetup {
   colorlinks,
   pdfinfo={
      Author={Shmuel (Seymour J.) Metz}
      Subject={Topology}
      Title={A Proposed Unification of Manifolds and Fibre Bundles}
   }
}
\begin{document}
  \null
\end{document}

The the author in the created PDF metadata is "Shmuel (Seymour J.) Metz Subject=Topology Title=A Proposed Unification of Manifolds and Fibre Bundles"; the other two fields are blank.

Answer 1

Option pdfinfo expect key value pairs, separated by commas. The latter, the commas between the key value pairs are missing. Then Author is the key and the remaining part is the value. With commas:

\documentclass{article}
\usepackage [colorlinks] {hyperref}
\hypersetup {
   colorlinks,
   pdfinfo={
      Author={Shmuel (Seymour J.) Metz},
      Subject={Topology},
      Title={A Proposed Unification of Manifolds and Fibre Bundles},
   }
}
\begin{document}
\null
\end{document}

Result with pdfinfo:

$ pdfinfo test.pdf
Title:          A Proposed Unification of Manifolds and Fibre Bundles
Subject:        Topology
Keywords:
Author:         Shmuel (Seymour J.) Metz
Creator:        LaTeX with hyperref package
Producer:       pdfTeX-1.40.17
CreationDate:   Mon Aug 15 19:17:29 2016
ModDate:        Mon Aug 15 19:17:29 2016
Tagged:         no
Form:           none
Pages:          1
Encrypted:      no
Page size:      612 x 792 pts (letter) (rotated 0 degrees)
File size:      8488 bytes
Optimized:      no
PDF version:    1.5