While the proven Zacks Rank places an emphasis on earnings estimates and estimate revisions to find strong stocks, we also know that investors tend to develop their own individual strategies. With this in mind, we are always looking at value, growth, and momentum trends to discover great companies.

Looking at the history of these trends, perhaps none is more beloved than value investing. This strategy simply looks to identify companies that are being undervalued by the broader market. Value investors use fundamental analysis and traditional valuation metrics to find stocks that they believe are being undervalued by the market at large.

Luckily, Zacks has developed its own Style Scores system in an effort to find stocks with specific traits. Value investors will be interested in the system's "Value" category. Stocks with both "A" grades in the Value category and high Zacks Ranks are among the strongest value stocks on the market right now.

One company value investors might notice is Heidrick & Struggles (HSII Quick QuoteHSII - Free Report) . HSII is currently sporting a Zacks Rank of #2 (Buy), as well as a Value grade of A. The stock is trading with a P/E ratio of 15.48, which compares to its industry's average of 17.26. HSII's Forward P/E has been as high as 45.88 and as low as 7.81, with a median of 16.01, all within the past year.

Investors should also note that HSII holds a PEG ratio of 1.56. This popular metric is similar to the widely-known P/E ratio, with the difference being that the PEG ratio also takes into account the company's expected earnings growth rate. HSII's PEG compares to its industry's average PEG of 2.48. Over the past 52 weeks, HSII's PEG has been as high as 4.59 and as low as 0.78, with a median of 1.46.

These are only a few of the key metrics included in Heidrick & Struggles's strong Value grade, but they help show that the stock is likely undervalued right now. When factoring in the strength of its earnings outlook, HSII looks like an impressive value stock at the moment.