Where to put the institute information in the article document class?

Question

I've seen in other document classes that one can input the authors' institutes via special commands, for example in revtex4 I can put

\title{Aggregation According to Classical Kinetics---From Nucleation to 
Coarsening}
\author{Yossi Farjoun}
\email{yfarjoun@math.mit.edu}
\thanks{Corresponding author}
\affiliation{G. Mill\'an Institute of Fluid Dynamics, Nanoscience and Industrial
Mathematics, Universidad Carlos III de Madrid, Spain}
\author{John C. Neu}%
\email{neu@math.berkeley.edu}
\affiliation{Department of Mathematics, University of California, Berkeley}

and it gets typeset nicely:

--snip--

Is there a nice of doing the same with plain-old article?

Answer 1

The authblk package does this:

\documentclass[a4paper]{article}
\usepackage[affil-it]{authblk}

\begin{document}

\title{Aggregation According to Classical Kinetics---From Nucleation to
Coarsening}

\author{Yossi Farjoun%
  \thanks{Electronic address: \texttt{yfarjoun@math.mit.edu}; Corresponding author}}
\affil{G. Mill\'an Institute of Fluid Dynamics,\\ Nanoscience and Industrial
Mathematics,\\ Universidad Carlos III de Madrid, Spain}

\author{John C. Neu%
  \thanks{Electronic address: \texttt{neu@math.berkeley.edu}}}
\affil{Department of Mathematics, University of California, Berkeley}

\date{Dated: \today}

\maketitle

\end{document}

Some tweaking to \@maketitle may be necessary, for example

\makeatletter
\def\@maketitle{%
  \newpage
  \null
  \vskip 2em%
  \begin{center}%
  \let \footnote \thanks
    {\Large\bfseries \@title \par}%
    \vskip 1.5em%
    {\normalsize
      \lineskip .5em%
      \begin{tabular}[t]{c}%
        \@author
      \end{tabular}\par}%
    \vskip 1em%
    {\normalsize \@date}%
  \end{center}%
  \par
  \vskip 1.5em}
\makeatother

With this you'd get

Answer 2

As article doesn't support it, you may use a titlepage environment. If you would like just to use the standard \maketitle, you could redefine this command or hook into the author macro.

The author is typeset using a simple table:

\begin{tabular}[t]{c}%
  \@author
\end{tabular}\par}

So, you could use tabular features inside the argument to \author. Simply use \\ for a new row, perhaps several times. It would be set below and centered. Demonstrating tabular commands:

\documentclass[titlepage]{article}
\usepackage[onehalfspacing]{setspace}
\begin{document}
\title{Aggregation According to Classical Kinetics---From
    Nucleation to Coarsening}
\author{Yossi Farjoun \\
  \multicolumn{1}{p{.7\textwidth}}{\centering\emph{G. Mill\'an Institute
  of Fluid Dynamics, Nanoscience and Industrial Mathematics,
  Universidad Carlos III de Madrid, Spain}}}
\maketitle
\end{document}

Output:

You could add further rows for further authors and institutes.

This is just a workaround and a demonstration what happens internally. I would recommend to use a titlepage environment instead of misusing the article \maketitle feature that isn't intended to be used with an institute.

Answer 3

If for some reason you need compatibility with Beamer's \institute command, you can also add it to \maketitle using etoolbox:

\documentclass{article}
\usepackage{etoolbox}
\makeatletter
\providecommand{\institute}[1]{% add institute to \maketitle
  \apptocmd{\@author}{\end{tabular}
    \par
    \begin{tabular}[t]{c}
    #1}{}{}
}
\makeatother

\title{Test}
\author{Tester 1 \and Tester 2}
\institute{University of Testing \and University of Diagnostics}
\date{2019}

\begin{document}
\maketitle
\end{document}