The Company has two reportable operating segments based on two primary areas of service. The Engineering and Other Scientific segment is a broad service group providing technical consulting in different practices primarily in engineering. The Environmental and Health segment provides services in the areas of environmental, epidemiology and health risk analysis. This segment provides a wide range of consulting services relating to environmental hazards and risks and the impact on both human health and the environment. Our Chief Executive Officer, the chief operating decision maker, reviews revenues and operating income for each of our reportable segments but does not review total assets in evaluating segment performance and capital allocation.

Segment information for the three and six months ended June 28, 2019 and June 29, 2018 follows:

	Three Months Ended				Six Months Ended
(In thousands)	June 28, 2019		June 29, 2018		June 28, 2019		June 29, 2018
Engineering and Other Scientific	$	86,820	$	77,080	$	167,074	$	154,127
Environmental and Health		19,686		18,541		38,463		37,951
Total revenues	$	106,506	$	95,621	$	205,537	$	192,078

	Three Months Ended						Six Months Ended
(In thousands)	June 28, 2019			June 29, 2018			June 28, 2019			June 29, 2018
Engineering and Other Scientific	$	29,252		$	25,802		$	55,226		$	51,715
Environmental and Health		7,039			6,156			13,235			12,780
Total segment operating income		36,291			31,958			68,461			64,495
Corporate operating expense		(11,468	)		(9,480	)		(27,884	)		(20,419	)
Total operating income	$	24,823		$	22,478		$	40,577		$	44,076

	Three Months Ended				Six Months Ended
(In thousands)	June 28, 2019		June 29, 2018		June 28, 2019		June 29, 2018
Engineering and Other Scientific	$	929	$	1,291	$	2,707	$	2,104
Environmental and Health		13		47		56		98
Total segment capital expenditures		942		1,338		2,763		2,202
Corporate capital expenditures		5,958		801		10,478		6,747
Total capital expenditures	$	6,900	$	2,139	$	13,241	$	8,949

	Three Months Ended				Six Months Ended
(In thousands)	June 28, 2019		June 29, 2018		June 28, 2019		June 29, 2018
Engineering and Other Scientific	$	1,170	$	1,121	$	2,291	$	2,216
Environmental and Health		48		41		93		80
Total segment depreciation and amortization		1,218		1,162		2,384		2,296
Corporate depreciation and amortization		424		432		848		853
Total depreciation and amortization	$	1,642	$	1,594	$	3,232	$	3,149

No single client comprised more than 10% of the Company’s revenues during the three and six months ended June 28, 2019. One client comprised 12% of the Company’s revenues during the three months ended June 29, 2018. The same client comprised 14% of the Company’s revenues during the six months ended June 29, 2018. No other single client comprised more than 10% of the Company’s revenues during the three and six months ended June 29, 2018. No single client comprised more than 10% of the Company’s accounts receivable at June 28, 2019 and December 28, 2018.