LaTeX Letterhead

\documentclass[11pt]{letter}
\usepackage[top=1in,bottom=1in,left=1in,right=1in]{geometry}
\usepackage{graphicx}
\usepackage{tcolorbox}
\usepackage{lipsum}
\usepackage{hyperref}
\colorlet{dkgreen}{green!20!black}  
\hypersetup{
  colorlinks=true,
  allcolors=dkgreen
}

\address{
  \begin{tcolorbox}[colback=white,colframe=dkgreen,sharp corners=uphill]
    \vspace{-0.6in}
    \begin{minipage}[b]{0.52\textwidth}
      \colorbox{white}{\includegraphics[height=1.0in]{gmu.png}}
    \end{minipage}
    \begin{minipage}{0.50\textwidth}
      \vspace{0.4in}
      {\large \bf \myname}\\
      \emph{\mytitle}\\
      \emph{\mydept}\\
      \emph{\myschool}\\
      \emph{\myaddress}\\
      {\myemail}; {\myweb}
    \end{minipage}
  \end{tcolorbox}  
}

\signature{\myname}

%%% Customizations below
\newcommand\myname{ThanhVu Nguyen}
\newcommand\mytitle{Assistant Professor}
\newcommand\mydept{Department of Computer Science}
\newcommand\myschool{George Mason University}
\newcommand\myaddress{4400 University Drive, Fairfax, VA 22030}
\newcommand\myemail{\href{mailto:tvn@gmu.edu}{\texttt{tvn@gmu.edu}}}
\newcommand\myweb{\href{https://go.gmu.edu/tvn}{\texttt{https://go.gmu.edu/tvn}}}


\begin{document}
\begin{letter}{}

  \date{\textbf{\today}}
  \opening{To whom it may concern:}

  \lipsum[2-8]

  \closing{Sincerely,}


  \ps{\textbf{Qualification}: Nguyen completed his Ph.D. in Computer Science at the University of New Mexico-Albuquerque and a postdoc at the University of Maryland-College Park. His research lies at the intersection of Software Engineering and Formal Methods, focusing on safety of AI and soundness and complexity of programs. He is the recipient of the NSF CAREER Award, the NSF CRII Award, an Amazon Research Award, an ACM SIGSOFT ICSE Most Influential Paper Award, an ACM SIGEVO Impact Award, the IFIP TC2 Manfred Paul Award for Excellence in Software: Theory and Practice, and the ACM SIGEVO ``Humies'' Gold Medal Award.}
  %\encl{} %Enclosures goes here
\end{letter}
\end{document}