Voicemail after business hours and providing alternative investment products to clients -- two things that Novato, Calif.-based asset management firm Hennessy Advisors avoids. That's because both the habit and product offering are examples of client disservice from the perspective of Neil Hennessy, the firm's founder and CEO, who sums up his approach as "straight and narrow."

Taking a simple approach hasn't hindered performance at Hennessy's firm, which reported $5.9 billion in assets under management at the end of 2014, a 33% increase from the previous year. In the first part of a conversation with Money Management Executive, Hennessy discussed his firm's approach and why it shuns some market trends.  

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