def timer_summary(timers, name):
    """
    Generate a summary of the timers that name has started.

    Args:
        timers: A dictionary whose values are Timer objects.
        name: The name of the author, will be used to select timers they own.

    Returns:
        A string that summarizes name's timers.
    """
    msg = "Active timers for __{}__:\n\n".format(name)

    user_timers = [x for x in timers.values() if name in x.key]
    if user_timers:
        for ind, timer in enumerate(user_timers, start=1):
            msg += "  **{}**) ".format(ind) + str(timer)
    else:
        msg += "**None**"

    return msg